Common Core · Grade 2
2.OA.A.1
Grade 2 — Use addition and subtraction within 100 to solve take-from, compare and unknown-addend problems.
A note on this mapping: This is where "the three stories subtraction tells" is named: taking away, comparing and finding a missing part are one standard.
The skill that covers it
What a student should be able to do
- Recall subtraction facts within 20 automatically.
- Subtract multi-digit numbers with regrouping, including across zeros.
- Use addition to check a subtraction result.
- Choose subtraction for "how many are left" and "how many more" problems.