Missing Number Subtraction Activity
This missing number subtraction activity gives 1st and 2nd grade students watermelon task cards that check themselves, plus a practice page. An answer key is included.
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About this resource
Description
This missing number subtraction activity helps children find the unknown number in subtraction sentences within 20. The missing number can be the starting number, the number taken away, or the difference. Solving these sentences helps children see how subtraction and addition are related, and it builds the fact fluency and number sense they need for first and second grade math.
Children use 12 fold-over Seed Check task cards with a fun watermelon theme. Each card shows a subtraction sentence with one empty box. Children find the missing number, write it on the Recording Sheet, and then flip the card to the watermelon side to check their answer. A 1st grade practice page with ten more missing number problems gives extra practice, and an answer key is included.
What’s Included
- A colorful cover and a How to Use page with prep tips and steps
- 12 self-checking fold-over task cards with subtraction sentences within 20
- A Recording Sheet for all 12 cards
- A 1st grade practice worksheet with ten missing number problems
- A task card answer key and a practice answer key
Why It Helps Kids Learn
- Finding an unknown in any position builds real understanding, not just memorized facts.
- Self-checking cards give children quick feedback and build independence.
- Thinking about related addition facts strengthens mental math strategies.
Ideas for Teachers and Parents
Use the cards in a math center, as a partner game, or for a quick morning warm-up with the whole class. Let children use counters or a number line to check their thinking. Challenge early finishers to write their own missing number sentences. This missing number subtraction activity is a great 1st grade subtraction activity and a helpful review for second grade.
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