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Cornerstone · Grades 3–5 Keystones #1 2 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 2 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄5 + 3⁄4

    Answer: 19⁄20
  2. 2. Algebra Two-step equations

    Solve: 7x + 8 = 85

    Answer: x = 11
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio Sharing in a ratio

    Divide 100 in the ratio 3:3:4

    Answer: 30, 30 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 22, 16, 7, 9, 10, 45, 34, 32

    Answer: 21.9

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