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Cornerstone · Grades 3–5 Keystones #1 9 April 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 9 April 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄6 + 1⁄6

    Answer: 1⁄3
  2. 2. Algebra Two-step equations

    Solve: 2x - 20 = -12

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 6cm and b = 15cm

    Answer: 16.16cm
  4. 4. Ratio Sharing in a ratio

    Divide 126 in the ratio 2:4:3

    Answer: 28, 56 and 42
  5. 5. Statistics Mean

    Calculate the mean of: 19, 30, 48, 7, 21, 30

    Answer: 25.8

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