2nd 9weeks project by Broden Marks

Rounding Decimals

bmark0236 — 2017-12-01 18:15:18 UTC

We round decimals to estimate the cost of things.
How to round decimals.
1) Underline the number you're rounding to.
2) Circle the number to the right which is the number that determines whether you round up or down.
3) 5 or higher add one more 4 or less just ignore

Multiplying decimals

bmark0236 — 2017-12-19 19:02:43 UTC

We multiply decimals to find how much money you pay per year if you are paying rent for something.
1) Line your numbers up from the digit from the far right.
2) Multiply each digit on the bottom to each digit on the top from the right to the left.
3) Add the products together.
4) Count up how many digits are behind the decimals from your factors. In your final product count that same number of digits going towards the left. Place your decimals there.

Dividing Decimals

bmark0236 — 2018-01-04 01:31:08 UTC

We divide decimals so when we share things like money with our friends, we each get an equal amount.
1) You need to figure out how many times you need move the decimal in your divisor to where you have a whole.
2) In order to maintain equality, you have to move the decimal in the dividend the same number of places that you had to move the decimal in the divisor.
3) Rewrite the equation using these new values.
4) If you have a decimal , move it up so you don't have to worry about it later.
5) Do the division problem just like you would without decimals.

Subtracting decimals

bmark0236 — 2018-01-04 14:34:32 UTC

When we use our debit cards we subtract decimals to see how much we have if we pay for something.
1) Line up your decimals
2) If needed add an 0 to the top number
3) Subtract as usual

Converting fractions to decimals

bmark0236 — 2018-01-04 14:45:22 UTC

Doctors have to convert decimals to fractions when they are giving shots.
1) Draw a table showing all the place values like ones place tenths place and so on
2) Fractions are a little bit of something so if you are converting a fraction to a decimal it cant be a whole unless you have a whole
3) You look at the denominator of the fraction and that determines where you're going to place the number like if you had 3/10 you're going to put the three in the tenths like this .3
1)33/100

2)4,367/10,000

3)4/10

4)903/1,000

5)7/10

6)12,038/100,000

7)123/1,000

8)12/100

9)9/10

10)8/8

answer key
1).33
2).4,367
3).4
4).903
5).7
6).12,038
7).123
8).12
9).9
10)1

Comparing Decimals

bmark0236 — 2018-01-04 15:24:22 UTC

We compare decimals when we see unit prices on tags at grocery stores
1) You see which ones bigger like .9 and .33 .9 is bigger because it is 9/10 and .33 is 33/100 and 9/10 is 90/100

1) .1 .33
2).234 .3
3).453 .5
4).3 .5
5).40 .5
6).5 .4
7).3 .55
8).45 .3
9) .3 .22
10) .4 .2
answer key
1)<
2)<
3)<
4)<
5)<
6)>
7)<
8)>
9)>
10)>

sources

bmark0236 — 2018-01-04 15:42:24 UTC

http://students.norledgemaths.com/rounding-to-decimal-places.html

https://www.google.com/search?q=how+to+subtract+decimals&rlz=1CADEAC_enUS778US778&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi7xqTY077YAhWI6yYKHU_xD4YQ_AUICygC&biw=1366&bih=629&safe=active&ssui=on#imgrc=zKfBoqEanM0x0M:

https://www.youtube.com/watch?v=mA6Gy4inUKM

Adding decimals

bmark0236 — 2018-01-04 17:17:42 UTC

When we use our debit cards we add decimals to see how much we have if we pay for something.
1) Line up your decimals
2) If needed add an 0 to the top number
3) Add as usual