Subtracting Decimals: Key Concepts and Techniques

What is the first step in subtracting positive and negative decimals?

• Line up the decimal points

• Subtract the smaller number from the larger number

• Add the opposite of the second number

• Change the sign of the first number

When subtracting 12.6 - 8.2, what is the final answer?

• 4.2

• 4.4

• 3.4

• 5.4

If you have a positive and a negative number, what operation do you perform?

• Add the numbers

• Subtract the numbers

• Multiply the numbers

• Divide the numbers

What is the result of 8.9 - 3.21?

• 6.69

• 5.79

• 6.79

• 5.69

When subtracting two negative numbers, what should you do?

• Ignore the signs

• Subtract the smaller number from the larger number

• Add the numbers together

• Change both signs to positive

What is the final answer for -102.4 - 78.04?

• -180.54

• -180.44

• -179.44

• -179.54

If the temperature drops 5.3 degrees from 91 degrees, what is the new temperature?

• 87.7 degrees

• 88.7 degrees

• 86.7 degrees

• 85.7 degrees

After the temperature rises 7.9 degrees from 85.7 degrees, what is the new temperature?

• 91.6 degrees

• 92.6 degrees

• 93.6 degrees

• 90.6 degrees

What is the final temperature after it drops another 10.1 degrees from 93.6 degrees?

• 85.5 degrees

• 86.5 degrees

• 83.5 degrees

• 84.5 degrees

How much change does Brooke get back if she spends $12.50 on a movie ticket, $4 on a coke, and $2.50 on candy from a $20 bill?

• $2

• $1

• $4

• $3