Adding and Subtracting Signed Decimals

​To add and subtract decimals

​Line Up the decimal points and the place values!

Then follow the rules for adding and subtracting integers.

​

Answer the next slides for a reminder.​

Some text here about the topic of discussion

Multiple Choice

When adding decimals with the same sign you.....

• subtract and take the sign of the larger number
• add the opposite
• add and keep the sign
• subtract and keep the sign

Fill in the Blank

Evaluate. -29.89 + -8.843

Multiple Choice

When adding decimals with different signs you....

• subtract and take the sign of the larger number
• add the opposite
• add and keep the sign
• subtract and keep the sign

Fill in the Blank

Evaluate. 2.96 + -8.12

Multiple Choice

-6.5 + (-0.5) 

• -7
• 7
• 6
• -6

Subtracting signed decimals

Just like subtracting signed integers, change the subtraction problem into an addition problem with,

KEEP CHANGE CHANGE​

​

Keep the first number, change the subtraction to addition and change the sign of the second number. Then follow the addition rules!​

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

Thor is drinking a 2 liter protein shake. He drank 0.98 liters of the protein shake. How much does Thor have left?

• 1.98

• 0.96

• 1.02

• 2.12

Multiple Choice

4.16 - 9.043

• -4.883
• 13.203
• 4.883
• -13.203

Multiple Choice

5.627 - (-4.1)

• 1.527

• 5.668

• 9.727

• 5.586

• -.1.527

Multiple Choice

34.5 + (-7)

• -41.5
• 41.5
• -27.5
• 27.5

Multiple Choice

What is the value of the expression -3.2 + 5 - 8?

• -6.2
• 6.2
• 1
• -1

Multiple Choice

The temperature in a town is 34.1°F during the day and −8.6°F at night. Find the difference in the temperatures.

• 42.7
• 25.5
• 42.7°F
• 25.5°F

Multiple Choice

-11.381 - 1.6

• 12.981

• -12.981

• 9.781

• -9.781

• -11.397

Fill in the Blank

What is the value of 56.3 + -29.45