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Cornerstone · Grades 3–5 Keystones #1 21 January 2020 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 January 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 5⁄12 + 3⁄12

    Answer: 2⁄3
  2. 2. Algebra Two-step equations

    Solve: 4x + 3 = 39

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 8cm and b = 12cm

    Answer: 14.42cm
  4. 4. Ratio Sharing in a ratio

    Divide 80 in the ratio 1:4:3

    Answer: 10, 40 and 30
  5. 5. Statistics Mean

    Calculate the mean of: 31, 41, 15, 9, 20, 41

    Answer: 26.2

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