Adding and Subtracting Decimals

​MGSE6.NS.3

 Fluently add and subtract multi-digit decimals using the standard algorithm for each operation.

Subject | Subject

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Adding and Subtracting Decimals

I can determine sums and differences by adding and subtracting decimals in order to fluently add and subtract multi-digit decimals using the standard algorithm.

Multiple Choice

Julie and Doug are building a tree house out of wood boards. Julie has a board that is 1.15 meters long and Doug has board that is 0.7 meter long. What is the combined length of their boards?

Two students solved the problem. Who is correct?

Adding Decimals

Adding decimals is like adding whole numbers. Before you add, line up the decimal points. This will make sure you are adding the correct place values together.

Subtracting Decimals

Do the same thing when you subtract decimals. You may need to regroup.

Numbers without a decimal point

If a number does not have a decimal point, add the decimal point at the end of the number.

Multiple Choice

How do you write the number 824 as a decimal?

• 8.24

• 0.824

• 82.4

• 824.0

Adding and Subtracting Decimals Review

I can solve problems by using the standard algorithm for adding and subtracting decimals.

Multiple Choice

Solve: 21 + 4.28

• 4.49

• 6.38

• 25.28

Multiple Choice

Solve: 7.05 - 4.6

• 2.45

• 3.65

• 11.65

• 11.45

Multiple Choice

Jim earned $22.50 on Monday, $14.75 on Tuesday, and $28 on Wednesday. How much did he earn, in all?

• $37.53

• $64.25

• $65.25

• $74.50

Multiple Choice

Sarai has been working to buy a new pair of shoes. So far, she has earned $33 by babysitting, $49.75 selling her old toys, and $27.50 selling lemonade. If she needs $100 for the new shoes, how much money does she have left over?

• $209.00

• $102.50

• $9.00

• $10.25