Start learning →

For every rational a and b, which equality holds?

Aa/b = b/a
Ba-b = b-a
Ca+b = ab
Dab = ba
Answer & Solution
Correct answer: D. ab = ba
Multiplication of rational numbers is commutative, so ab always equals ba.
Practise this question with Quill — ICSE Class 8 →

Keep practising Rational Numbers

Browse all Rational Numbers questions for ICSE Class 8, or explore more Mathematics topics.

Start a Rational Numbers lesson →
Related questions
A negative rational is multiplied by a positive rational. The result is?If a > 0 and 0 < b < 1, which statement is true?For 0 < a < 1 and 0 < b < 1, how does ab compare with a?If b is nonzero and a/b = 1, which relation must hold?Take the reciprocal of -3/4, then its additive inverse. What results?Which subtraction gives a result outside the positive rationals?If 0 < a < b, which comparison is correct?Rationals a,b have ab = 0. What follows?