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A weather chart shows five readings: −13°C, 13°C, −31°C, 0°C and 3°C. Which reading is the coldest and which is the warmest?

Class 6IntegersIntegers
  • AColdest −13°C, warmest 13°C
  • BColdest 0°C, warmest −31°C
  • CColdest −31°C, warmest 13°C
  • DColdest −31°C, warmest 3°C

Step-by-Step Solution

Coldest means furthest left on the number line, which is −31°C, and warmest means furthest right, which is 13°C. Choosing −13°C as the coldest overlooks that −31 lies even further out on the negative side.
Answer: C) Coldest −31°C, warmest 13°C

Key idea: Comparing integers

On the number line, the integer on the **right** is the **larger** one. So 5 > 2, but also −2 > −5. This often surprises students: even though 5 is bigger than 2, **−5 is smaller than −2**, because −5 is further to the left. Any positive integer is larger than any negative integer, and zero sits between them.

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