🔢 Mathematics · Addition & Subtraction
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
Typical age: 7–8 years
“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?”
0 / 3 mastered