Curriculum placement
Grade 2. This describes the skill, not a learner estimate.
Addition and subtraction facts
Recall addition and subtraction facts within twenty
Problem types
- Make ten to add
- Subtract by thinking addition
- Choose the subtraction a fact helps solve
Builds on
- Subtracting within 20
- Addition and subtraction facts within 5 · Earlier idea
Instant recall of small facts is the base for related addition and subtraction facts up to 20.
- Number bonds to 10 · Earlier idea
Each number bond gives a fact family: if 3 and 4 make 7, then 3 + 4, 4 + 3, 7 - 3 and 7 - 4 all describe the same bond.
Leads to
- One-digit multiplication facts · Extend the idea
Multiplication facts are repeated addition facts, so 4 + 4 + 4 shows 3 x 4.
- Patterns in the operations · See it applied
Each next multiple in a times table adds the same number, a pattern found with addition facts.
- Multiplication as equal groups · See it applied
Repeated addition of equal groups gives a multiplication total, so fluent sums make equal-group totals easier.
Related skills
- Quotients from related facts · Related idea
Subtraction undoes addition the same way division undoes multiplication, so choosing the subtraction an addition fact helps solve prepares choosing the division a multiplication fact helps solve.
- Finding a missing number · Shared foundations
- Subtracting within 100 · Shared foundations
Open the interactive map to explore lessons and skill connections.