Common Core Mathematics Practice for Grade 1
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Description: 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 24513 - Determine the Unknown Number in the Addition or Subtraction Equation (up to 20):
1. 5 + 6 = |
6. 14 - = 3 |
2. 20 - = 6 |
7. 3 + 9 = |
3. 12 - = 1 |
8. + 2 = 4 |
4. + 9 = 11 |
9. 9 + 1 = |
5. 19 - 3 = |
10. 1 + 5 = |
Printable #: 24513-CCSS.Math.Content.1.OA.D.8
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