A pupil checks whether 5 minus 9 equals 9 minus 5. Subtraction of integers is:
AFully commutative
BAlways reversible
CNever dependable
DNot commutative
Answer & Solution
Correct answer: D. Not commutative
1. The two results are -4 and 4, which differ.
2. Order therefore matters in subtraction.
3. So subtraction is not commutative.
_Source: syllabus Mathematics Class VII, Chapter 1, Integers._
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