Example 1 · level 1
Write −28/40 in standard form.
Show solution
- HCF(28, 40) = 4.
- Standard form: −7/10.
Answer: -7/10
CLASS 7 MATHS · RATIONAL NUMBERS
Rational numbers in standard form and their sum
Standard form: denominator positive, numerator and denominator with no common factor. To add, use a common denominator.
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Worked examples
Example 2 · level 2
Write −27/−33 in standard form.
Show solution
- Move the sign: −27/−33 = 27/33.
- HCF(27, 33) = 3.
- Standard form: 9/11.
Answer: 9/11
Example 3 · level 3
−4/5 + 8/5 = ? (answer in standard form)
Show solution
- −4/5 + 8/5 = −4/5 + 8/5
- = 4/5
- = 4/5.
Answer: 4/5