Add and Subtract Decimals Using Friendly Numbers

What did the student incorrectly do while solving this equation?

• Subtracted instead of added the amounts together

• Nothing, the student solved the problem correctly

• Did not line up the decimal points

What is the sum of 51.37 and 24.50?

• 26.87

• 7,587.00

• 75.87

What word problem can be represented by 51.37 + 24.5? Hint: Read the possible answers CAREFULLY!

• Fifty-one dollars and thirty-seven cents less than Twenty-four dollars and fifty cents.

• Fifty-one dollars and thirty-seven cents more than Twenty-four dollars and fifty cents.

• Fifty-one dollars and thirty-seven cents more than Twenty-four dollars and five cents.

What is the sum 0.04 and 9.9?

• 99.4

• 0.14

• 9.94

Jackson spends $12.85 on a book, $5.89 for lunch, and $2.35 for a magazine. How much money did he spend in all? (a)  

• $12.85

• $21.09

• $15.20

• $18.74

The second step for adding or subtracting decimals is _________________.

• Stick a Zero in any empty space.

• Line them Up

• Borrowing

• Regroup

What is the last step when you are adding or subtracting decimals?

• Line them up

• Drag the point

• Move the decimal point to the end.

When Adding and Subtracting decimals

• We don't line up the Decimal point

• We line up the decimal point

• We get rid of the decimal points.

• We skip the problem

What is the difference between 7.88 and 6.50?

• 14.38

• 1.38

• 138.00

Michael and Hannah are solving a math puzzle. What does the term "compensation" mean in mathematics?

• Keeping the numbers the same to make the calculation harder.

• Adjusting/changing one or both numbers to make them "friendlier" numbers to calculate to solve.

• Changing the operation to make the calculation harder.

• Ignoring the numbers to make the calculation easier.