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Cornerstone · Grades 3–5 Keystones #1 18 September 2020 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 18 September 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄6 + 4⁄7

    Answer: 31⁄42
  2. 2. Algebra Two-step equations

    Solve: 5x - 20 = 15

    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 90 in the ratio 2:1:3

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

    Calculate the mean of: 30, 43, 9, 31, 48, 48, 11

    Answer: 31.4

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