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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?

$8 - 8 = square$
$8 + square = 8$
1. 0
2. 4
3. 8
4. 16

2.
What number goes in the box?

$16 - 8 = square$
$8 + square = 16$
1. 2
2. 4
3. 6
4. 8
3.
What number goes in the box?

$15 - 5 = square$
$5 + square = 15$
1. 5
2. 10
3. 15
4. 20

4.
What number goes in the box?

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

$12 - 8 = square$
$8 + square = 12$
1. 2
2. 4
3. 16
4. 20

6.
What number goes in the box?

$7 - 3 = square$
$3 + square = 7$
1. 3
2. 4
3. 5
4. 6
7.
What number goes in the box?

$5 - 1 = square$
$1 + square = 5$
1. 1
2. 2
3. 3
4. 4

8.
What number goes in the box?

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

$20 - 5 = square$
$5 + square = 20$
1. 5
2. 10
3. 15
4. 20

10.
What number goes in the box?

$6 - 4 = square$
$4 + square = 6$
1. 2
2. 4
3. 8
4. 10
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