Add-To, Result Unknown
1.OA.1 — Add and subtract within 20 to solve word problems involving add-to, take-from, put-together, take-apart, and compare situations, with unknowns in all positions
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What is on the three Add-To, Result Unknown worksheets
- Support
- draws a part-part-whole bar beside every problem.
- On level
- The grade's own level, with no drawings.
- Challenge
- moves the missing number out of the answer slot.
Example problems from the on-level sheet
- Zoe brought 4 marbles to school. Lily brought 9 more. How many marbles are there in all?
- Mei counted 9 pencils. Then Mei found 10 more. How many pencils does Mei have now?
- There were 9 grapes on the mat. Sam put in 8 more. How many grapes are there now?
Every sheet is generated, so the numbers are different each time you make one.
Before this: K.OA.2 — solve addition and subtraction word problems, and add and subtract within 10.