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# 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.

**Q2: **

Are they equal?

- ANo
- BYes

**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.