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Cornerstone · Grades 3–5 Keystones #1 4 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 4 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄6 + 5⁄7

    Answer: 65⁄42
  2. 2. Algebra Two-step equations

    Solve: 4x - 7 = 53

    Answer: x = 15
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Divide 196 in the ratio 2:1:4

    Answer: 56, 28 and 112
  5. 5. Statistics Mean

    Find the mean of: 12, 13, 10, 6

    Answer: 10.25

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