Math Lab
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Fraction of a Whole Number

Fractions · Class IV

Find p/q of a number , like 3/4 of 20.

3
type a value
110
4
type a value
110
20
type a value
1100
Live values
  • Fraction value0.75
  • Result15
xy
  • (p/q) of x

Formulas in this lab

  • Fraction value
    p/qp/q
  • Result
    (p/q)⋅n(p/q)\cdot n
Tip: Taking p/q of a number is a straight line through the origin with slope p/q.

Frequently asked questions

▶What does fraction of a whole number mean?

It means taking a part of a whole number, like 3/4 of 20. To find it, divide the number by the bottom, then multiply by the top. So 3/4 of 20 is 5 times 3, which is 15.

▶How do I use this fraction lab?

Pick a fraction with one slider and a whole number with another. The lab works out the answer step by step, showing the division and multiplication clearly.

▶When is this useful?

If a shop gives 1/4 off on a 200 rupee shirt, you save 50 rupees. If your class of 40 has 3/5 boys, that is 24 boys. Fractions of numbers are everywhere.

▶Tip for fractions of a number

First divide by the bottom (denominator), then multiply by the top (numerator). For 2/3 of 18: divide 18 by 3 to get 6, then multiply by 2 to get 12. Easy in two steps.