ArithmeticOcean math mission
Win the Big Wave Race
Name: Date:
Solve 10 problems to help Fish win the big wave race.
115 − = 9
2 − 10 = 8
318 − = 9
411 − = 5
517 − = 8
6 − 3 = 16
7 − 4 = 16
810 − = 1
9 − 10 = 0
1018 − = 15
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Missing number subtraction worksheets
These free printable worksheets blank out one number in a subtraction sentence within twenty — sometimes the number you start with, sometimes the number taken away — so a child has to reason about the whole relationship instead of following a procedure.
- Answer key included
- Reopen this exact sheet
- Letter & A4 ready
Ready-to-print previewMissing number subtraction
Ocean math mission
Answer key
1. 15 − 6 = 92. 18 − 10 = 83. 18 − 9 = 94. 11 − 6 = 55. 17 − 9 = 86. 19 − 3 = 167. 20 − 4 = 168. 10 − 9 = 19. 10 − 10 = 010. 18 − 3 = 15
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About this worksheet
The two blanks are genuinely different problems. Finding the missing subtrahend in 15 − __ = 8 is a counting-up question: how far from 8 up to 15? Finding the missing minuend in __ − 6 = 9 runs the other way and is solved by adding. A child who has met both stops treating the minus sign as an instruction to always subtract whatever they can see.
This is where subtraction as difference finally earns its keep. Counting up from the smaller number is usually faster and less error-prone than counting back, and a page of gaps makes that strategy the obvious one to reach for. Children who only meet take-away problems rarely discover it on their own.
Numbers stay within twenty so the thinking stays visible. Print with the answer key, change the theme or how many questions fit, or reopen the identical sheet later from its picnic basket code.
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Open it in the Arithmetic maker to change the level, theme, question count, and paper size. Every sheet prints with an answer key and a picnic basket code that reopens the exact same questions later.