- A−32 m
- B32 m
- C−16 m
- D−28 m
Step-by-Step Solution
The lift is at floor 6 and the star is at B2, i.e. floor . Change in floors ; change in height m.
Answer: A) −32 m
Each floor of this building is 4 m high. The lift goes from where it is now to the floor with the star. Taking up as positive, what is the change in its height?
Class 7Integers (Extended)Integers
Key idea: Multiplying integers — same sign vs different sign
**Same sign → positive.**
(both positive)
(both negative — still positive)
**Different signs → negative.**
3 × (−4) = −12
(−3) × 4 = −12
**Why two negatives become positive:** think of −3 as 'the opposite of 3'. So = 'the opposite of ' = the opposite of −12 = +12. The double-negative cancels.
(both positive)
(both negative — still positive)
**Different signs → negative.**
3 × (−4) = −12
(−3) × 4 = −12
**Why two negatives become positive:** think of −3 as 'the opposite of 3'. So = 'the opposite of ' = the opposite of −12 = +12. The double-negative cancels.
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