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Cornerstone · Grades 3–5 Keystones #1 17 March 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 17 March 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 6⁄7 + 2⁄4

    Answer: 19⁄14
  2. 2. Algebra Two-step equations

    Solve: 2x + 14 = 28

    Answer: x = 7
  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 162 in the ratio 3:2:1

    Answer: 81, 54 and 27
  5. 5. Statistics Mean

    Calculate the mean of: 15, 15, 10, 9, 32, 10, 48, 50

    Answer: 23.6

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