Add Subtract Multiply or Divide Decimals

When MULTIPLYING DECIMALS count the decimal places in each factor and ...

• Move that total amount of decimal places in your answer.

• Subtract.

• Find the square root.

• BE HAPPY!

When adding or subtracting with decimals, you -

• Move decimals out

• Shift decimals 3 places over

• Line up the decimals

• Ignore decimals

• A

• B

• C

• D

You are saving your money to buy a hoverboard that costs $168. You plan to save $8.50 each week. How many whole weeks will you have to save to have enough money?

-12.4 + 9.2 + 1 

Mathematical Equivalence

ON

Which student correctly solved their math problem?

• Both

• Neither

• Gayle

• Ian

When multiplying with decimals, you -

• line up the decimals

• "Raise the roof"

• "Slide & Slide"

• bump out the decimals, multiply, & bump them back in

What do you have to do before you can add or subtract decimals?

• Remove the decimal

• Line up the decimals

12.1 + 1.3

14.73 + 12