Mathematics
Addition & Subtraction
Representational
11–13 yrs
Positive and Negative Numbers
正数与负数
Description
Understand positive and negative numbers as describing quantities with opposite directions or values; use them in context such as temperature, floors in a building, and bank balances
Mastery Evidence
- Represent positive and negative numbers on a number line and explain what zero means in context
- Add a positive or negative number to any integer using number line reasoning
- Subtract a positive or negative number from any integer, understanding that subtracting a negative is equivalent to adding
Assessment Prompt
If your child sees temperatures like −3°C and +5°C on a weather forecast, can they figure out how much warmer one day is than the other — even when the answer crosses zero?
