Addition Question
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Grade 2 Addition CCSS: 2.NBT.B.5
What is the rule for this input/output table?
| Input | Output |
|---|---|
| 15 | 35 |
| 39 | 59 |
| 61 | 81 |
| 78 | 98 |
- add 20
- add 25
- subtract 20
- subtract 25