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Cornerstone · Grades 3–5 Keystones #1 23 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 23 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 5⁄7

    Answer: 39⁄35
  2. 2. Algebra Two-step equations

    Solve: 4x + 7 = 43

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

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 153 in the ratio 2:3:4

    Answer: 34, 51 and 68
  5. 5. Statistics Mean

    Calculate the mean of: 34, 8, 21, 47, 10, 11

    Answer: 21.8

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