GMy GYM MathMOE-aligned Primary Maths
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P5 · Topic

Percentage

Percentage always means 'out of 100'. Always ask: of what?

Big Idea
Percentage always means 'out of 100'. Always ask: of what?
45%= 45/100= 0.45
Percent, fraction and decimal are one value.
Key points
  1. 1Convert to fractions/decimals to compute: 35% = 35/100.
  2. 2Discount price = original × (100 − d)%.
  3. 3For '% of remainder', redraw the bar for the remainder first.
  4. 4Check: parts must add up to 100%.
Worked example
  1. 1Girls = 100% − 35% = 65% of total.
  2. 265% of total = 260, so 1% = 4.
  3. 3Total = 100 × 4 = 400.
Answer: 400
GYM Teaching Tip
Underline the whole in the question. Every % must refer to it.
See the question behind this example
35% of the pupils in a school are boys. There are 260 girls. How many pupils are there?