## Related Resources

The various resources listed below are aligned to the same standard, (1OA08) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtraction Worksheet shown above.

*Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ – 3, 6 + 6 = _.*

### Worksheet

#### To 10

- Missing Numbers With Adding & Subtracting to 10 #1 e.g. 6 – __ = 4, __ + 3 = 7
- Missing Numbers With Adding & Subtracting to 10 #2

#### To 20

- Missing Numbers With Adding & Subtracting to 20 #1
- Missing Numbers With Adding & Subtracting to 20 #2 e.g. 12 – __ = 7, __ + 9 = 17

#### Worksheet Generator

Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

*Work with addition and subtraction equations*

- Sums to 9 (1 of 3) e.g. 6 + 3 (both horizontal and vertical addition) (From Worksheet)
- Sums to 9 (2 of 3) e.g. 6 + 3 (both horizontal and vertical addition) (From Worksheet)
- Numbers to 9 (1 of 3) e.g. 8 – 4 (both horizontal and vertical formats) (From Worksheet)
- Numbers to 9 (2 of 3) e.g. 8 – 4 (both horizontal and vertical formats) (From Worksheet)
- 1-digit numbers e.g. 6 + 3, 9 – 4 (From Worksheet)
- Sums to 9 (3 of 3) e.g. 6 + 3 (From Worksheet)
- Sums to 12 e.g. 8 + 4 (From Worksheet)