# data[].attributes.attachment_link.authors[].name
2023 MrNussbaum.com is a copyright of the Nussbaum Education Network,LLC.

# data[].attributes.attachment_link.description
This section contains hundreds of workshops, games, videos, printables, and interactive, online activities related to decimals.

# data[].attributes.attachment_link.readable_text
Mental Math - visualize decimal number patterns

Common Core Connections - Grades 4 and 5

Understand decimal notation.
Compare two decimals to hundredths by reasoning about their size.
Identify arithmetic patterns.
Compare two decimals to hundredths by reasoning about their size.

# data[].attributes.attachment_link.title
Decimal Chart Patterns | Math Playground

# data[].attributes.attachment_link.description
Decimal Chart Patterns at Math Playground.com! Explore tenths, hunredths, number patterns and more.

# data[].attributes.attachment_link.readable_text
For students, decimals are often a challenging concept to grasp. This interactive decimal strips tool helps students model and visualize decimals. When using the online decimal strips tool, students can model, explore, and compare decimals. Additionally, the decimal strips are a useful interactive tool for modeling and solving operations involving decimals.

Using the interactive decimal strips tool is easy. Simply drag the decimal strips on or off the canvas. Modify the chart so that two whole units can be displayed by clicking on the "Unit Double" button. Write on the canvas using the pencil button and click on the eraser symbol to erase. To clear the whole canvas, click on the trash can symbol.

Here are a few suggestions for using the interactive decimal strips tool:

Ask students to model a given decimal such as .25 or .70

Ask students to model and solve an operation involving decimals.

Invite students to drag various decimals onto the canvas and compare their values. You can even have students write statements using , and = signs.

Visit classplayground.com for related decimal printables such as strips, decimal place value charts, and more.

# data[].attributes.attachment_link.title
Decimal Strips | Free Virtual Manipulatives | Toy Theater

# data[].attributes.attachment_link.description
This interactive decimal strips tool brings the topic to life so students can visualize, model, and explore decimals. Plus, it's free!

# data[].attributes.attachment_link.readable_text
Franken Wife

Start rounding decimals with Zapzapmath! There have been mysterious power outages all around the Zapzapmath ecosystem, and they have caused multiple concerns to be sent to the mayor. The mayor has contacted you to help determine what is causing these outages, and how to prevent it from happening again.

You study the map to distinguish what the source of all the outages is. It seems all the affected areas are surrounding one specific location: Frankenstein's castle! Cryptic secrets shroud Doctor Frankenstein's castle with a looming sense of fear, but the mayor and ecosystem is counting on you, so you take a deep breath, count to four, and slowly knock on the door.

Footsteps boom and the door creaks open, and standing there is Doctor Frankenstein, happy as a clam can be. He welcomes you in with the friendliest of smiles, and tells you about a grand plan to make a wife for himself. He has created a mathling to call his own, and he wants to bring her to life through the power of electricity.

Though the plan is great, Doctor Frankenstein cannot seem to get the right calculations of electrical surges to bring his wife to life. Every single time he gets the estimates wrong, it causes a massive power failure.

Now that you have an explanation for all the outages, it is time to find a solution to not only restore electricity back to Zapzapmath, but also to help Doctor Frankenstein make for himself a happy wife! To do so, you need to start rounding decimals up to the closest hundredths or thousandths by sliding the control bar towards the correct answer.

The correct answer will create a surge of electricity and charge the two Leyden jar capacitors, bringing Franken Wife to life. Rounding decimals wrongly will cause yet another power failure, and Franken Wife will remain lifeless. So do your best and start rounding decimals up; the fate of Doctor Frankenstein's chance at romance remains in your hands!

Franken Wife is a game that teaches you to get into the habit of rounding decimals. We can round decimals to a certain number of decimal places to create a kind of estimation where exact values are not too significant. The practice of rounding decimals is used to make a number easier, but keeping its value close to what it is.

To start, first find the place value or rounding digit that you want, and look at the number on the right of it. If that number on the right is less than 5, you leave the rounding digit as it is and drop all digits behind it. If that number is greater than or equals 5, you add 1 to your rounding digit and drop all digits behind it.

Now that you know how to round off decimals, it is time to bring romance to life!

# data[].attributes.attachment_link.description
Start rounding decimals with Zapzapmath! There have been mysterious power outages all around the Zapzapmath ecosystem, and they have caused multiple concerns to be sent to the mayor. The mayor has contacted you to help determine what is causing these outages, and how to prevent it from happening again.

# data[].attributes.attachment_link.title
Worksheets | Free - Distance Learning, worksheets and more: CommonCoreSheets

# data[].attributes.attachment_link.description
Free Comparing to Thousandths worksheets. Easier to grade, more in-depth and best of all... 100% FREE! Kindergarten, 1st Grade, 2nd Grade, 3rd Grade, 4th Grade, 5th Grade and more!

# data[].attributes.attachment_link.title
Rounding Decimals: StudyJams! Math | Scholastic.com

# data[].attributes.attachment_link.description
Sometimes we make decimals simpler to work with by rounding them to whole numbers. In this activity, students will learn to round decimals to solve problems.

# data[].attributes.attachment_link.readable_text
What is "Rounding" ?

Rounding means making a number simpler but keeping its value close to what it was.
The result is less accurate, but easier to use.
Example: 73 rounded to the nearest ten is 70, because 73 is closer to 70 than to 80. But 76 goes up to 80.

Common Method

There are several different methods for rounding. Here we look at the common method, the one used by most people.

First some examples (explanations follow):

How to Round Numbers

Decide which is the last digit to keep

Leave it the same if the next digit is less than 5 (this is called rounding down)

But increase it by 1 if the next digit is 5 or more (this is called rounding up)

Example: Round 74 to the nearest 10

We want to keep the "7" (it is in the 10s position)

The next digit is "4" which is less than 5, so no change is needed to "7"

Answer: 70
(74 gets "rounded down")

Example: Round 86 to the nearest 10

We want to keep the "8"

The next digit is "6" which is 5 or more, so increase the "8" by 1 to "9"

Answer: 90
(86 gets "rounded up")

So: when the first digit removed is 5 or more, increase the last digit remaining by 1.

Why does 5 go up ?

5 is in the middle ... so we could go up or down. But we need a method that everyone agrees to.

So think about sport: we should have the same number of players on each team, right?

0,1,2,3 and 4 are on team "down"

5,6,7,8 and 9 are on team "up"

And that is the "common" method of rounding. Read about other methods of rounding.

A farmer counted 87 cows in the field, but when he rounded them up he had 90.

Rounding Decimals

First work out which number will be left when we finish.

Rounding to tenths means to leave one number after the decimal point.

Rounding to hundredths means to leave two numbers after the decimal point.

etc.

3.1416 rounded to hundredths is 3.14

as the next digit (1) is less than 5

3.1416 rounded to thousandths is 3.142

as the next digit (6) is more than 5

1.2735 rounded to tenths is 1.3

as the next digit (7) is 5 or more

To round to "so many decimal places" count that many digits from the decimal point:

1.2735 rounded to 3 decimal places is 1.274

as the next digit (5) is 5 or more

Rounding Whole Numbers

We may want to round to tens, hundreds, etc, In this case we replace the removed digits with zero.

134.9 rounded to tens is 130

as the next digit (4) is less than 5

12,690 rounded to thousands is 13,000

as the next digit (6) is 5 or more

15.239 rounded to ones is 15

as the next digit (2) is less than 5

Rounding to Significant Digits

To round to "so many" significant digits, count digits from left to right, and then round off from there.

1.239 rounded to 3 significant digits is 1.24

as the next digit (9) is 5 or more

134.9 rounded to 1 significant digit is 100

as the next digit (3) is less than 5

When there are leading zeros (such as 0.006), don't count them because they are only there to show how small the number is:

0.0165 rounded to 2 significant digits is 0.017

as the next digit (5) is 5 or more

Significant Digit Calculator

(Try increasing or decreasing the number of significant digits. Also try numbers with lots of zeros in front of them like 0.00314, 0.0000314 etc)

# data[].attributes.attachment_link.description
Rounding means making a number simpler but keeping its value close to what it was. The result is less accurate, but easier to use. Example: 73 rounded to the nearest ten is 70, because 73 is closer to 70 than to 80. But 76 goes up to 80.