# Lesson Worksheet: Subtracting Numbers up to 100 Using Compensation Mathematics • 2nd Grade

In this worksheet, we will practice subtracting two numbers by breaking them apart and combining them to give us numbers that are easier to subtract.

Q1:

Find the missing number. Q2:

Are they equal? • ANo
• BYes

Q3:

David knows a way to make finding easier. What is ?

What is ?

Q4:

Think about the difference  . If we add the same amount to both numbers, the difference does not change. Pick a calculation that has the same difference as .

• A
• B
• C
• D

Find .

Q5:

Mason is learning ways to subtract.

Pick the calculation that would tell him the length of the orange bar. • A
• B
• C
• D

He adds 3 to both numbers. Is the length of the blue bar the same as the length of the orange bar? • ANo
• BYes

Pick the calculation with the same answer as .

• A
• B
• C
• D

What is ?

Q6:

When given a difficult subtraction, we can find easier numbers to help us subtract.

Add 4 to both numbers. Write the new calculation. • A
• B
• C
• D

The new calculation has the same answer as .

What is ?

Q7:

James is investigating patterns in subtraction sentences with the same difference.

He uses a model to write these expressions which are all equal to 8. What number is missing?

The first numbers in the expressions (25, 27, 29) follow the pattern add 2.

What pattern do the second numbers follow?

• Aadd 2
• Bsubtract 2

Investigate other subtraction expressions that are equal to 8.

Find the missing number. Q8:

If you know that , find .

Q9:

If you know that , find .

Q10:

Find by starting with 42, subtracting 20 then adding 1.

This lesson includes 1 additional question and 27 additional question variations for subscribers.

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