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Cornerstone · Grades 3–5 Keystones #1 16 July 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 16 July 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄5 + 4⁄7

    Answer: 27⁄35
  2. 2. Algebra Two-step equations

    Solve: 2x + 15 = 35

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

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

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

    Divide 140 in the ratio 2:2:3

    Answer: 40, 40 and 60
  5. 5. Statistics Mean

    Calculate the mean of: 43, 16, 11, 27, 28, 6, 13

    Answer: 20.6

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