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Cornerstone · Grades 3–5 Keystones #1 13 September 2013 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 13 September 2013 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄6 + 3⁄5

    Answer: 11⁄10
  2. 2. Algebra Two-step equations

    Solve: 5x + 7 = 57

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Share 30 in the ratio 2:1

    Answer: 20 and 10
  5. 5. Statistics Mean

    Calculate the mean of: 37, 24, 13, 18, 17, 40, 31, 31. Give your answer to 2 decimal places

    Answer: 26.38

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