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Cornerstone · Grades 3–5 Keystones #1 20 February 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 February 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄4 + 5⁄7

    Answer: 41⁄28
  2. 2. Algebra Two-step equations

    Solve: 2x + 12 = 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

    Divide 280 in the ratio 1:2:2

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

    Calculate the mean of: 34, 45, 12, 7, 11, 18, 50

    Answer: 25.3

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