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Write the missing numbers that add up to 20. The first one is done for you. |
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7 + |
8 + 12 = 20 |
6 + 14 = 20 |

17 + 3 = 20 |
6 + 14 = 20 |
12 + 8 = 20 |

5 + 15 = 20 |
4 + 16 = 20 |
19 + 1 = 20 |

5 + 15 = 20 | 14 + 6 = 20 | 13 + 7 = 20 |

11 + 9 = 20 |
17 + 3 = 20 | 18 + 2 = 20 |

12 + 8 = 20 | 3 + 17 = 20 | 9 + 11 = 20 |

20 + 0 = 20 | 15 + 5 = 20 |
10 + 10 = 20 |

14 + 6 = 20 |
11 + 9 = 20 | 7 + 13 = 20 |

10 + 10 = 20 | 8 + 12 = 20 |
0 + 20 = 20 |

12 + 8 = 20 | 13 + 7 = 20 | 19 + 1 = 20 |

11 + 9 = 20 |
7 + 13 = 20 | 8 + 12 = 20 |

15 + 5 = 20 | 4 + 16 = 20 | 13 + 7 = 20 |

15 + 5 = 20 |
14 + 6 = 20 |
19 + 1 = 20 |

7 + 13 = 20 |
16 + 4 = 20 |
2 + 18 = 20 |

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The various resources listed below are aligned to the same standard, (2NBT05) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtraction Worksheet shown above.

*Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. *

- Addition with making 20 e.g. 18 + 7 = 25
- Addition with making multiples of 10 e.g. 66 + 8 = 74

- Making (Bridging) Multiples of 10 e.g. 17 + 5, 78 + 7

- Number bonds to 30 e.g.26 + ___ = 30
- Number bonds to 40 e.g.12 + ___ = 40
- Number bonds to 50 e.g.17 + ___ = 50
- Number bonds to 100 e.g. 43 + ___ = 100
- Number Bonds To 100 (with blank number lines)

- Adding To Subtract e.g. 45 - 27 = (45+3 = 48) - (27+3=30) = 18

- 2-digit & 1-digit - no regrouping e.g. 34 + 5, 56 - 4
- 2-digit numbers - no regrouping e.g. 42 + 36, 34 + 12
- 2-digit numbers - regrouping e.g. 47 + 16, 78 - 29
- 2-digit - 1-digit - no regrouping e.g. 68 - 5
- 2-digit - 1-digit - regrouping e.g. 65 - 7
- 2-digit - 2 -digit - no regrouping e.g. 86 - 43
- 2-digit - 2-digit - regrouping e.g. 57 - 39

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:

*Use place value understanding and properties of operations to add and subtract*

- Adding 3 Numbers (in easiest order) e.g. 27 + 13 + 15 (From Worksheet)
- Addition & Subtraction: 1 of 3 (within 1000) (From Worksheet)
- Addition & Subtraction: 2 of 3 (within 1000) (From Worksheet)
- Addition & Subtraction: 3 of 3 (within 1000) (From Worksheet)
- Subtracting with Regrouping Ten (includes base ten block visuals) (From Worksheet)
- Subtraction with regrouping (with place value blocks) (From Worksheet)
- Three 1-digit numbers e.g. 3 + 4 + 8 (From Worksheet)
- Three 2-digit numbers e.g. 35 + 14 + 26 (From Worksheet)
- Four 1-digit numbers e.g. 3 + 4 + 8 + 2 (From Worksheet)