Subtraction of Decimals with Place Value Blocks

Charlene Welsh, a teacher at Parkside Elementary, demonstrates how to subtract decimals using place value blocks. The problem involves comparing the weights of apples and oranges. She models the subtraction process by breaking down the numbers into place values and renaming them as needed to perform the subtraction. The final result shows that apples weigh 1.38 pounds more than oranges, and an equation is written to represent this calculation.

What is the weight of the apples mentioned in the problem?

• 3.84 pounds

• 2.22 pounds

• 1.84 pounds

• 3.22 pounds

Why does the teacher decide to use subtraction to solve the problem?

• Because the problem asks for the sum of weights

• Because the problem asks for the product of weights

• Because the problem asks for the difference in weight

• Because the problem asks for the total weight

What tool does the teacher use to keep her work neat?

• A ruler

• A number line

• A place value chart

• A calculator

How many tenths does the teacher place on the chart to represent the weight of the apples?

• 1 tenth

• 4 tenths

• 2 tenths

• 3 tenths

What does the teacher do when she cannot take away 4 hundredths?

• She adds more hundredths

• She renames 1 tenth as 10 hundredths

• She subtracts directly

• She renames 1 whole as 10 tenths

What is the result after taking away 4 hundredths?

• 9 hundredths left

• 8 hundredths left

• 7 hundredths left

• 6 hundredths left

What does the teacher do when she cannot take away 8 tenths?

• She subtracts directly

• She renames 1 whole as 10 tenths

• She renames 1 tenth as 10 hundredths

• She adds more tenths

How many tenths are left after taking away 8 tenths?

• 4 tenths

• 3 tenths

• 2 tenths

• 1 tenth

What is the final difference in weight between the apples and the oranges?

• 1.22 pounds

• 1.58 pounds

• 1.38 pounds

• 1.48 pounds