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Write the missing numbers that add up to 40. The first one is done for you. |
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13 + 27 = 40 |
6 + 34 = 40 | 18 + 22 = 40 |

5 + 35 = 40 | 24 + 16 = 40 | 19 + 21 = 40 |

15 + 25 = 40 | 14 + 26 = 40 | 39 + 1 = 40 |

27 + 13 = 40 | 26 + 14 = 40 | 12 + 28 = 40 |

25 + 15 = 40 | 24 + 16 = 40 | 33 + 7 = 40 |

31 + 9 = 40 | 18 + 22 = 40 | 18 + 22 = 40 |

22 + 18 = 40 | 2 + 38 = 40 | 19 + 21 = 40 |

20 + 20 = 40 | 15 + 25 = 40 | 10 + 30 = 40 |

14 + 26 = 40 | 11 + 29 = 40 | 37 + 3 = 40 |

10 + 30 = 40 | 18 + 22 = 40 | 1 + 39 = 40 |

21 + 19 = 40 | 7 + 33 = 40 | 38 + 2 = 40 |

15 + 25 = 40 | 24 + 16 = 40 | 13 + 27 = 40 |

22 + 18 = 40 | 13 + 27 = 40 | 29 + 11 = 40 |

17 + 23 = 40 | 28 + 12 = 40 | 2 + 38 = 40 |

Numbers Bonds for: 10 | 20 | 30 | 40 | 50 | 100 |

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## Related Resources

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. *

### Flashcard

### Game

#### Matching Game

### Lesson

### Quiz

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

### Worksheet

#### Bridging

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

#### Number bonds

- Number bonds to 20 e.g.8 + ___ = 20
- Number bonds to 30 e.g.26 + ___ = 30
- Number bonds to 50 e.g.17 + ___ = 50
- Number bonds to 100 e.g. 43 + ___ = 100
- Number Bonds To 100 (with blank number lines)

#### Slightly Different

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

#### To 100

- 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)