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One winter day the Indian research station Bharati in Antarctica recorded −24°C while Maitri recorded −31°C. Which station was warmer, and by how many degrees?

Class 6IntegersIntegers
  • AMaitri, by 7°C
  • BBharati, by 7°C
  • CBharati, by 55°C
  • DMaitri, by 55°C

Step-by-Step Solution

−24 lies to the right of −31 on the number line, so Bharati was the warmer station. The gap is −24 − (−31) = −24 + 31 = 7°C. Answering 55 comes from adding 24 and 31 instead of measuring the distance between the two readings.
Answer: B) Bharati, by 7°C

Key idea: Subtracting integers

Subtraction of integers is just adding the **opposite**: a − b = a + (−b). So 5 − 8 = 5 + (−8) = −3. And 5 − (−8) = 5 + 8 = 13. The 'minus minus' that looks confusing in symbols is simply: subtracting a negative is the same as adding its positive twin. Always rewrite subtraction as addition of the opposite — it removes every sign-error trap.

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