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

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

  1. 1. Number Adding fractions

    Add: 3⁄5 + 2⁄7

    Answer: 31⁄35
  2. 2. Algebra Two-step equations

    Solve: 6x + 13 = 73

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

    Calculate the hypotenuse when a = 8cm and b = 15cm

    Answer: 17cm
  4. 4. Ratio Sharing in a ratio

    Divide 250 in the ratio 4:3:3

    Answer: 100, 75 and 75
  5. 5. Statistics Mean

    Find the mean of: 5, 13, 16

    Answer: 11.333333333333

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