Decomposing Numbers in Subtraction

The video tutorial explains how to perform subtraction by decomposing numbers, similar to addition but with a few different steps. It uses a non-regrouping problem, 27 minus 12, to demonstrate the process. The method involves writing the problem horizontally, identifying tens and ones, and subtracting them separately. The final step is to add the results of the subtractions to get the final answer. The tutorial emphasizes the similarity to addition decomposition but highlights the key difference in the subtraction step.

What is the first method introduced for subtraction in the video?

• Using a number line

• Borrowing and regrouping

• Decomposing numbers using subtraction

• Decomposing numbers using addition

When decomposing numbers, what is the first step?

• Draw a number line

• Write the problem vertically

• Write the problem horizontally

• Use a calculator

In the example 27 minus 12, how many tens are in the number 27?

• 3

• 2

• 4

• 1

What is the value of the tens in the number 12?

• 20

• 5

• 10

• 15

What operation is performed after identifying the tens and ones?

• Addition

• Multiplication

• Subtraction

• Division

What is the result of subtracting the tens in the example 27 minus 12?

• 10

• 5

• 15

• 20

What is the result of subtracting the ones in the example 27 minus 12?

• 4

• 6

• 5

• 3

What is the final step in the decomposing subtraction method?

• Multiply the totals

• Subtract the totals

• Add the totals

• Divide the totals

What is the final answer for the subtraction problem 27 minus 12 using decomposing?

• 10

• 12

• 15

• 17

Which step in the decomposing method involves addition?

• Adding the results

• Subtracting tens

• Identifying tens and ones

• Subtracting ones