Let’s solve each number sentence step by step. We need to find the missing number that makes both sides equal.
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1) 13 - 4 = 6 + ___
Left side: 13 - 4 = 9
So, 6 + ___ = 9 → ___ = 9 - 6 =
3
2) 9 + ___ = 8 + 3
Right side: 8 + 3 = 11
So, 9 + ___ = 11 → ___ = 11 - 9 =
2
3) ___ + 3 = 10 + 7
Right side: 10 + 7 = 17
So, ___ + 3 = 17 → ___ = 17 - 3 =
14
4) 11 + 3 = 15 - ___
Left side: 11 + 3 = 14
So, 15 - ___ = 14 → ___ = 15 - 14 =
1
5) 9 + 5 = 7 + ___
Left side: 9 + 5 = 14
So, 7 + ___ = 14 → ___ = 14 - 7 =
7
6) ___ - 8 = 12 + 0
Right side: 12 + 0 = 12
So, ___ - 8 = 12 → ___ = 12 + 8 =
20
7) 3 + 9 = ___ + 5
Left side: 3 + 9 = 12
So, ___ + 5 = 12 → ___ = 12 - 5 =
7
8) 11 - ___ = 4 + 2
Right side: 4 + 2 = 6
So, 11 - ___ = 6 → ___ = 11 - 6 =
5
9) 6 + 6 = ___ + 5
Left side: 6 + 6 = 12
So, ___ + 5 = 12 → ___ = 12 - 5 =
7
10) 3 + 4 = 10 - ___
Left side: 3 + 4 = 7
So, 10 - ___ = 7 → ___ = 10 - 7 =
3
11) 16 + ___ = 20 - 3
Right side: 20 - 3 = 17
So, 16 + ___ = 17 → ___ = 17 - 16 =
1
12) 11 + 5 = ___ + 10
Left side: 11 + 5 = 16
So, ___ + 10 = 16 → ___ = 16 - 10 =
6
13) 5 + 8 = 12 + ___
Left side: 5 + 8 = 13
So, 12 + ___ = 13 → ___ = 13 - 12 =
1
14) 0 + 7 = 10 - ___
Left side: 0 + 7 = 7
So, 10 - ___ = 7 → ___ = 10 - 7 =
3
15) ___ - 4 = 2 + 5
Right side: 2 + 5 = 7
So, ___ - 4 = 7 → ___ = 7 + 4 =
11
16) 10 + 4 = 7 + ___
Left side: 10 + 4 = 14
So, 7 + ___ = 14 → ___ = 14 - 7 =
7
17) 12 - 2 = ___ = 5 ← This looks like a typo. Probably meant:
“12 - 2 = ___” and then “___ = 5”? But that doesn’t make sense.
Wait — maybe it’s: “12 - 2 = ___” and the “= 5” is part of another problem?
Looking again: It says “12 - 2 = ___ = 5” — that can’t be right because 12-2=10, not 5.
Possibly a misprint. Maybe it should be: “12 - ___ = 5”? Let’s assume that’s what was intended (since otherwise it’s impossible).
If 12 - ___ = 5 → ___ = 12 - 5 =
7
But let’s check original: “12 - 2 = ___ = 5” — perhaps it’s two separate things? No, likely error.
Alternative interpretation: Maybe it’s “12 - 2 = ___” and then separately “___ = 5” — but that would mean blank is 10 and also 5? Contradiction.
Best guess: Typo. Should be “12 - ___ = 5”. So answer =
7
*(Note: If we take it literally as written, it’s invalid. But for homework, we’ll go with corrected version.)*
18) 19 - ___ = 10 + 4
Right side: 10 + 4 = 14
So, 19 - ___ = 14 → ___ = 19 - 14 =
5
19) ___ + 6 = 3 + 9
Right side: 3 + 9 = 12
So, ___ + 6 = 12 → ___ = 12 - 6 =
6
20) 5 + 9 = 14 - ___
Left side: 5 + 9 = 14
So, 14 - ___ = 14 → ___ = 14 - 14 =
0
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Now, double-checking #17: Original says “12 - 2 = ___ = 5”. That must be an error. In many worksheets, sometimes they write “A = B = C” meaning A=B and B=C. But 12-2=10, so if ___=10, then 10=5? False. So definitely typo. Most likely intended: “12 - ___ = 5”. We’ll go with that.
Final Answers:
1) 3
2) 2
3) 14
4) 1
5) 7
6) 20
7) 7
8) 5
9) 7
10) 3
11) 1
12) 6
13) 1
14) 3
15) 11
16) 7
17) 7 *(assuming correction)*
18) 5
19) 6
20) 0
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Final Answer:
1) 3
2) 2
3) 14
4) 1
5) 7
6) 20
7) 7
8) 5
9) 7
10) 3
11) 1
12) 6
13) 1
14) 3
15) 11
16) 7
17) 7
18) 5
19) 6
20) 0
Parent Tip: Review the logic above to help your child master the concept of math sentences worksheet.
