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Subtraction and Unknown Addends

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Subtraction and Unknown Addends Answer Key

1. 
What number goes in the box?

[math]8 - 8 = square[/math]
[math]8 + square = 8[/math]
  1. 0
  2. 4
  3. 8
  4. 16
 
2. 
What number goes in the box?

[math]16 - 8 = square[/math]
[math]8 + square = 16[/math]
  1. 2
  2. 4
  3. 6
  4. 8
3. 
What number goes in the box?

[math]15 - 5 = square[/math]
[math]5 + square = 15[/math]
  1. 5
  2. 10
  3. 15
  4. 20
 
4. 
What number goes in the box?

[math]14 - 4 = square[/math]
[math]4 + square = 14[/math]
  1. 1
  2. 8
  3. 10
  4. 18
5. 
What number goes in the box?

[math]12 - 8 = square[/math]
[math]8 + square = 12[/math]
  1. 2
  2. 4
  3. 16
  4. 20
 
6. 
What number goes in the box?

[math]7 - 3 = square[/math]
[math]3 + square = 7[/math]
  1. 3
  2. 4
  3. 5
  4. 6
7. 
What number goes in the box?

[math]5 - 1 = square[/math]
[math]1 + square = 5[/math]
  1. 1
  2. 2
  3. 3
  4. 4
 
8. 
What number goes in the box?

[math]10 - 8 = square[/math]
[math]8 + square = 10[/math]
  1. 2
  2. 8
  3. 12
  4. 18
9. 
What number goes in the box?

[math]20 - 5 = square[/math]
[math]5 + square = 20[/math]
  1. 5
  2. 10
  3. 15
  4. 20
 
10. 
What number goes in the box?

[math]6 - 4 = square[/math]
[math]4 + square = 6[/math]
  1. 2
  2. 4
  3. 8
  4. 10

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