Fluent adding and subtracting within 20
Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers
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Teaching Table
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“Can your child instantly recall all the single-digit addition facts — like '7 + 8 = 15' — without needing to count or think for more than a second?”
Full guide and materials
- Activity. Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers
What to notice. Answer any single-digit addition fact within 3 seconds • Recall subtraction facts within 20 from memory (e.g. 15 − 8 = 7) • Use known addition facts to derive related subtraction facts rapidly
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Can your child instantly recall all the single-digit addition facts — like '7 + 8 = 15' — without needing to count or think for more than a second?
Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers
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Check understanding
- Answer any single-digit addition fact within 3 seconds
- Recall subtraction facts within 20 from memory (e.g. 15 − 8 = 7)
- Use known addition facts to derive related subtraction facts rapidly
“Can your child instantly recall all the single-digit addition facts — like '7 + 8 = 15' — without needing to count or think for more than a second?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 7–8
Standards