Mathematics
Addition & Subtraction
Procedural
7–8 yrs
Adding numbers
数字加法
Description
Add up to four two-digit numbers using strategies based on place value and properties of operations
Mastery Evidence
- Add three or four two-digit numbers by grouping tens and ones
- Look for pairs that make multiples of 10 to simplify addition
- Explain the strategy used to combine multiple addends
Assessment Prompt
Can your child add up four two-digit numbers — like '14 + 23 + 32 + 19' — by grouping them cleverly, rather than just plodding through from left to right?
Prerequisites 2
Fluent adding and subtracting within 100
需要熟练掌握100以内的加法，才能将多个两位数相加
Adding Three Small Numbers
将四个两位数相加是对三个一位数相加的延伸
Unlocks 0
No follow-up topics
