Mathematics Class 8
Fractions in Disguise
Spot a percentage, take one, find one, and compare two groups fairly.
11 lessons · ~66 min total
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Lessons in this topic
- 0 Start here A roadmap: what a percentage compares, its three names, taking one, and comparing groups. · 3 min You are here
- 1 A comparison with a hundred underneath A percentage compares an amount with a hundred, and the second number never moves. · 6 min
- 2 Three names for one amount A fraction, a decimal and a percentage can all mark one amount. · 6 min
- 3 Taking a percentage of an amount Build the percentage from 10% and 5% pieces, or take one hundredth first. · 6 min
- 4 One amount said as a percentage of another Divide the part by the whole, then multiply by a hundred. · 6 min
- 5 Measured against what you started with A rise or a fall is always a percentage of the starting amount. · 6 min
- 6 An equal rise and fall do not cancel The second percentage is taken of a different amount, so an equal rise and fall do not cancel. · 7 min
- 7 Comparing two groups of different sizes Counts from groups of different sizes do not compare fairly. Their shares do. · 7 min
- 8 Where percentages are used Name the whole first: a target, a marked price or a total. A percentage can pass 100. · 7 min
- 9 The big picture Eight ideas, tied back together. · 5 min
- 10 Track quiz Cheat-sheet table plus a reveal quiz — one question per idea. · 7 min
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