How do you subtract rational numbers?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Subtraction follows the same rules as addition, but subtract the numerators.
Same denominator: p/q - r/q = (p - r)/q
Different denominators: p/q - r/s = (p × s - r × q)/(q × s)
Example: Subtract 5/6 - 1/4
Step 1: LCM(6, 4) = 12
Step 2: Convert
- 5/6 = 10/12
- 1/4 = 3/12
Step 3: Subtract
- 10/12 - 3/12 = 7/12
Answer: 7/12
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