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Cornerstone · Grades 3–5 Keystones #1 15 September 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 15 September 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄3 + 7⁄8

    Answer: 29⁄24
  2. 2. Algebra Two-step equations

    Solve: 5x + 15 = 75

    Answer: x = 12
  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 90 in the ratio 3:1:2

    Answer: 45, 15 and 30
  5. 5. Statistics Mean

    Find the mean of: 2, 2, 14, 19, 20

    Answer: 11.4

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