Adding, Subtracting, Multiplying, Dividing Decimals Word Problems

When ​ (a)   decimals, I must always ​ (b)   the decimals.

• adding or subtracting

• line up

• multiplying or dividing

• get rid of

What is the rule for adding or subtracting decimals?

• Add first

• Line up the decimals first, then fill in with zeros.

• Move the decimal to the right the total amount of numbers after the decimal.

• Subtract

7.2 - 4.3 =

• 2.9

• 3.9

• 3.1

• 2.1

Where does the decimal go in this product?

7.8 x 3.2

• 24.96

• 2.496

• 249.6

• 0.2496

Every week Joshua runs 2.1 miles on Monday, 3.1 miles on Wednesday, 4.05 miles on Thursday, and 2.65 miles on Friday. How many total miles will he run in a week?

• 11.2

• 11.9

• 19.1

• 12.6

Mrs. Bentley took her two nieces to the zoo this past weekend. They bought two child tickets that cost $5.99 each, an adult ticket that cost $12.99, three lunches that cost $7.49 each and 3 waters that cost $4 each. If Mrs. Bentley brought a $100 bill, how much change did she receive?

• 40.56

• 59.44

• 41.44

• 100.00

Answer the question above.

• A

• B

• C

• D

What is the first step in this problem?

• Divide 9 by 8

• Move the decimal place 1 place to the left in the divisor and dividend.

• Move the decimal place 1 place to the right in the divisor and dividend.

When multiplying two positive numbers together the answer will be _______________________.

• Negative

• Positive

When can you use the Keep, Change, Change method?

• Addition and Subtraction Problems

• Multiplication and Division Problems