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Cornerstone · Grades 3–5 Keystones #1 14 March 2013 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 14 March 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄4 + 1⁄3

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

    Solve: 7x + 12 = 47

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 8cm and b = 15cm

    Answer: 17cm
  4. 4. Ratio Sharing in a ratio

    Divide 250 in the ratio 4:3:3

    Answer: 100, 75 and 75
  5. 5. Statistics Mean

    Calculate the mean of: 28, 21, 26, 20, 6, 30, 45, 45. Give your answer to 2 decimal places

    Answer: 27.63

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