Mathematics
Addition & Subtraction
Procedural
5–6 yrs
Adding and subtracting
加法与减法
Description
Add and subtract one-digit and two-digit numbers to 20, including zero
Mastery Evidence
- Calculate 14 + 5 = 19
- Calculate 17 – 3 = 14
- Add or subtract 0 and explain the result stays the same
Assessment Prompt
Can your child work out sums like '14 + 5' or '18 − 6' in their head or on paper, and do they know that adding or taking away zero leaves the number unchanged?
Prerequisites 1
Number bonds
20以内加减法的程序性计算需要掌握数的组成（凑数）
