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Games of all levels & types

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Mangahigh | Online Math Resource | Game Based Learning for Students

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Mangahigh - Where every child finds fun in learning. A digital math resource for blended learning. Transform your teaching with game-based learning. Used by thousands of students every day.

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Example of Sales Tax problem

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How to Figure Out the Percentage of Increase Between Two Differences

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Solving for x when it is in the numerator of a fraction

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Multiply by LCM to get rid of fractions (can also multiply by all the denominators)

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On BOTH sides of the equation!

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Solving an equation with distributive property on both sides

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Khan Academy

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Ratios, rates, and proportions — Basic example | Math | New SAT | Khan Academy

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Conversions

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Math Antics - Finding A Percent Of A Number

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Positive & Negative Numbers

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Positive & Negative Numbers

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Using tables & graphs

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How to visually identify proportional relationships using graphs | 7th grade | Khan Academy

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Equations of proportional relationships | 7th grade | Khan Academy

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Equations with variables on both sides: 20-7x=6x-6

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Sal solves the equation 20 - 7x = 6x - 6.

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Strategy: How to cross cancel (this is used in Fraction Busters)

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Cross Cancellation when Multiplying Fractions

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Monterey Institute for Technology and Education

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

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Mental Math - combine positive and negative numbers
Problem Solving - match math expressions with their correct values

Common Core Connection for Grades 6 and 7

Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers.

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Play Orbit Integers at Math Playground! Combine integers to power up your space racer.

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Integer Addition/Subtraction

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Mental Math - combine numbers to make target sums

Common Core Connection for Grades 4-6

Positive and negative numbers describe quantities having opposite directions or values.
Opposite signs of numbers indicate locations on opposite sides of 0 on a number line.
Position integers on a horizontal or vertical number line diagram.
Understand ordering and absolute value of rational numbers.

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Play Math Lines Integers at MathPlayground.com! Create number bonds whose sum matches the target number.

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Worked out examples --> practice link

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The order of operations tells us the order to solve steps in expressions with more than one operation. First, we solve any operations inside of parentheses or brackets. Second, we solve any exponents. Third, we solve all multiplication and division from left to right. Fourth, we solve all addition and subtraction from left to right.

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One event

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In order to find the probability of picking a yellow marble from a bag, we have to first determine the number of possible outcomes, and then how many of them meet our constraints.

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Seeing connection between 2D & 3D.. uses color coating to help you visualize

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Intro to nets of polyhedra (video) | Khan Academy

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Admittedly, "nets of polyhedra" sounds like the title of a bad sci-fi movie about man-eating, multi-headed fish. But in reality, nets of polyhedra are just 2D objects that wrap around 3D objects, like wrapping paper around presents.

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- What I want to do in this video is get some practice finding surface areas of figures by opening them up into what's called nets. And one way to think about it is if you had a figure like this, and if it was made out of cardboard, and if you were to cut it, if you were to cut it right where I'm drawing this red, and also right over here and right over there, and right over there and also in the back where you can't see just now, it would open up into something like this. So if you were to open it up, it would open up into something like this. And when you open it up, it's much easier to figure out the surface area. So the surface area of this figure, when we open that up, we can just figure out the surface area of each of these regions. So let's think about it. So what's first of all the surface area, what's the surface area of this, right over here? Well in the net, that corresponds to this area, it's a triangle, it has a base of 12 and height of eight. So this area right over here is going to be one half times the base, so times 12, times the height, times eight. So this is the same thing as six times eight, which is equal to 48 whatever units, or square units. This is going to be units of area. So that's going to be 48 square units, and up here is the exact same thing. That's the exact same thing. You can't see it in this figure, but if it was transparent, if it was transparent, it would be this backside right over here, but that's also going to be 48. 48 square units. Now we can think about the areas of I guess you can consider them to be the side panels. So that's a side panel right over there. It's 14 high and 10 wide, this is the other side panel. It's also this length over here is the same as this length. It's also 14 high and 10 wide. So this side panel is this one right over here. And then you have one on the other side. And so the area of each of these 14 times 10, they are 140 square units. This one is also 140 square units. And then finally we just have to figure out the area of I guess you can say the base of the figure, so this whole region right over here, which is this area, which is that area right over there. And that's going to be 12 by 14. So this area is 12 times 14, which is equal to let's see. 12 times 12 is 144 plus another 24, so it's 168. So the total area is going to be, let's see. If you add this one and that one, you get 96. 96 square units. The two magenta, I guess you can say, side panels, 140 plus 140, that's 280. 280. And then you have this base that comes in at 168. We want it to be that same color. 168. One, 68. Add them all together, and we get the surface area for the entire figure. And it was super valuable to open it up into this net because we can make sure we got all the sides. We didn't have to kinda rotate it in our brains. Although you could do that as well. So, with six plus zero plus eight is 14. Regroup the one ten to the tens place, there's now one ten. So one plus nine is ten, plus eight is 18, plus six is 24, and then you have two plus two plus one is five. So the surface area of this figure is 544. 544 square units.

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Surface area using a net: triangular prism (video) | Khan Academy

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What I want to do in this video is get some practice finding surface areas of figures by opening them up into what's called nets.

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Video transcript

in a previous video we figured out how to find the surface area of this cereal box by figuring out the areas of each of the six surfaces of the box and then adding them all up I'm going to do that again in this video but I'm going to do it by visualizing a net for the box and the way I think about a net of a box like this is what would happen if you were to if you were to if you were to cut the cardboard and then flatten it all out so what am I talking about well what we have here we could imagine making a cut in the box and the cut could be see I can make a cut back here so I could make a cut right over there I could cut it I could cut it right like this I could cut it like that so if I just did that this top flap would flap open so that would be able to come out like that and then I could also make a cut for this side so I can make a cut back there and I could make a cut right over here and now this side could flap forward and I could do the same thing on this other side right over here then that could flap forward and then the back side and I could I could draw it so I would also have a cut I'll draw it as a dotted line because you're not be able you're not supposed to be able to see this cut but the corresponding cut to this one on this side that we can't see we draw it a little bit neater than that the corresponding cut would be right back here right back there and then a cut right over here and so what would happen if we were to flatten all of this out well we would have we would have the front of the box I'll try to draw this as neatly as I can so the front of the box looks like this we would have this top flap which looks like this if we were to flatten it all out we have these two side flaps so that's a side flap that's a side flap and this is another this side flap right over here that's a side flap then we would have the bottom of the box so the bottom of the box is going to look like this bottom of the box and then we have the back of the box at the bottom is going to be connected to we didn't we didn't cut that so we have the back of the box the back of the box looks like this and there we have it we've made the net this is what would happen if you made the cuts that I talked about and then flatten the box out it would look like this now how could we use this net to find the surface area well we just need to figure out the surface area of this of this shape now so how do we do that well we know a lot about the dimensions we know that this width right over here that this is 10 centimeters 10 centimeters from there to there we know the height actually going all the way from here all the way up because the height of the box is 20 centimeters so this is going to be 20 centimeters right over here then you have another 20 centimeters you have another 20 centimeters right over here and right over here if you like and then you have see the depth of the box is 3 centimeters so this is 3 centimeters 3 centimeters and then this is 3 centimeters and so what is the area actually let me just do one region first what is the area of this entire region that I am that I am shading in with this blue color well it's 10 centimeters that is I'll do it in a color that you can see a little bit more easily it is 10 centimeters wide 10 centimeters times what's the height 20 plus 3 plus 20 plus 3 so that's going to be 40 plus 6 so times 46 centimeters that's this blue area so that's going to be 460 460 square centimeters 460 square centimeters and now we just have to figure out the area of the two flaps so this flap right over here is 20 centimeters by 3 centimeters so that's 60 centimeters squared so 60 centimeters squared or 60 square centimeters I should say and then this flap is going to have the exact same area another 60 square centimeters 60 square centimeters and you add everything together we deserve a little bit of a drumroll we get well this is going to add up to 500 and eighty square centimeters which is the exact thing we got in the other video where we didn't use the net and you should just it's nice to be able to do it either way to be able to visualize the net or be able to look at this and and think about the different sides even the sides that you might know that so not necessarily see

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Surface area of a box using nets (video) | Khan Academy

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ʕ•ᴥ•ʔ Surface Area of a Cylinder - Understand in 3 minutes

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Quickly master how to find the surface area of a cylinder. Watch more lessons like this and try our practice at https://www.studypug.com/us/en/math/college-algebra/surface-area-of-cylinders As long as we have the diameter or radius and the height of the cylinder, we are able to find its surface area in no time.

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grade 8  free math games practice common core standards

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Multiplication with exponents - Grade 8 - Practice with Math Games

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Simplify algebraic equations by multiplying variables with exponents.

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grade 8  free math games practice common core standards

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Division with exponents - Grade 8 - Practice with Math Games

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Simplify algebraic equations by dividing variables with exponents.

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Multiplication & Division with Exponents

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Multiplication & Division with Exponents

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grade 8  free math games practice common core standards

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Multiplication and division with exponents - Grade 8 - Practice with Math Games

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Simplify algebraic equations by multiplying and dividing variables with exponents.

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grade 8  free math games practice common core standards

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Understanding Negative Exponents - Grade 8 - Practice with Math Games

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Understand negative exponents and find its equivalent.

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grade 8  free math games practice common core standards

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Exponents with negative bases - Grade 8 - Practice with Math Games

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Practice evaluating exponents with negative bases.

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Visual puzzles