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Cornerstone · Grades 3–5 Keystones #1 12 March 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 12 March 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄6 + 1⁄5

    Answer: 11⁄30
  2. 2. Algebra Two-step equations

    Solve: 3x - 12 = 18

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 80 in the ratio 3:2:3

    Answer: 30, 20 and 30
  5. 5. Statistics Mean

    Calculate the mean of: 16, 23, 32, 14, 36, 30, 49

    Answer: 28.6

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