Mathematics
Addition & Subtraction
Procedural
7–8 yrs
Mentally adding hundreds to 3-digit numbers
心算三位数加整百数
Description
Mentally add and subtract a three-digit number and hundreds
Mastery Evidence
- Calculate 345 + 200 mentally
- Calculate 762 − 400 mentally
- Explain that only the hundreds digit changes
Assessment Prompt
Can your child quickly work out '342 + 200' or '756 − 300' in their head — knowing that only the hundreds digit changes?
Prerequisites 2
The three digits of a three-digit number
百位数的心算加减法需要掌握三位数的位值概念
10 or 100 More or Less
在找出多或少100的基础上，延伸至加减任意100的倍数
Unlocks 0
No follow-up topics
