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Cornerstone · Grades 3–5 Keystones #1 20 December 2013 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 December 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄3 + 3⁄5

    Answer: 19⁄15
  2. 2. Algebra Two-step equations

    Solve: 3x + 3 = 21

    Answer: x = 6
  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

    Share 42 in the ratio 2:1

    Answer: 28 and 14
  5. 5. Statistics Mean

    Calculate the mean of: 11, 18, 49, 43, 34, 27. Give your answer to 2 decimal places

    Answer: 30.33

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