Mastering Adding and Subtracting Decimals

What is the first step in adding decimals?

• Check for reasonableness

• Round to the nearest whole number

• Add the ones place

• Line up the decimals

How do you check if your decimal addition answer is reasonable?

• Divide the numbers

• Multiply the numbers

• Round to the nearest whole number and add

• Subtract the numbers

What is the correct way to align decimals for addition?

• Align the rightmost digits

• Align the decimal points

• Align the leftmost digits

• No need to align

What is the result of 18.46 + 13.31 - 5.6?

• 26.77

• 26.17

• 25.87

• 27.17

In subtracting decimals, what do you do if there are not enough ones?

• Borrow from the tens

• Add more ones

• Ignore the ones

• Multiply the ones

How do you regroup when subtracting decimals and there aren't enough tenths?

• Multiply the tenths

• Ignore the tenths

• Add more tenths

• Borrow from the ones

What is the sum of 6.84, 2.9, and 5.22?

• 14.96

• 15.16

• 15.06

• 14.86

After buying a movie for $15.89 and music for $12.50 from $35.50, how much is left?

• $7.11

• $6.91

• $7.01

• $7.21

Is the answer of 4.32 to the operation 5.31 + 2.8 - 1.27 reasonable?

• Yes

• No

• Maybe

• Insufficient information

What is the first step in checking the reasonableness of your answer in decimal operations?

• Subtract the numbers

• Round to the nearest whole number

• Multiply the numbers

• Divide the numbers