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Cornerstone · Grades 3–5 Keystones #1 20 February 2012 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 February 2012 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄4 + 2⁄6

    Answer: 13⁄12
  2. 2. Algebra Two-step equations

    Solve: 5x + 6 = 21

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

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 52 in the ratio 3:1

    Answer: 39 and 13
  5. 5. Statistics Mean

    Calculate the mean of: 36, 29, 21, 42, 31, 36

    Answer: 32.5

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