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Cornerstone · Grades 3–5 Keystones #1 21 June 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 June 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄7 + 3⁄5

    Answer: 41⁄35
  2. 2. Algebra Two-step equations

    Solve: 3x + 8 = 20

    Answer: x = 4
  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

    Share 80 in the ratio 3:1

    Answer: 60 and 20
  5. 5. Statistics Mean

    Calculate the mean of: 8, 26, 37, 49, 17, 43, 30, 14

    Answer: 28

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