Calculations can be carried out using fractions of shapes and quantities. Mixed fractions can be added or subtracted to find the number of fractional parts in a mixed number.
Part of Application of MathsNumeracy skills
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How do we find \(\frac{3}{5}\,of\,20\)
Find \(\frac{1}{5}\,of\,20\), then multiply by \(3\).
\(\frac{1}{5}\,of\,20 = 20 \div 5 = 4\)
We need \(\frac{3}{5}\,of\,20\), so we multiply \(4\) by \(3\).
\(\frac{3}{5}\,of\,20 = 4 \times 3 = 12\)
Multiply \(\frac{3}{5}\) by \(20\).
\(\frac{3}{5} \times 20 = \frac{3}{5} \times \frac{{20}}{1} = \frac{{60}}{5} = 12\)
Now try this question.
Use either method to find \(\frac{3}{7}\,of\,35\).
The answer is \(15\).
Using Method 1: \(\frac{1}{7}\,of\,35 = 5\), and \(3 \times 5 = 15\).