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Cornerstone · Grades 3–5 Keystones #1 4 January 2015 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 4 January 2015 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄6 + 1⁄5

    Answer: 31⁄30
  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

    Share 102 in the ratio 1:2

    Answer: 34 and 68
  5. 5. Statistics Mean

    Calculate the mean of: 16, 26, 45, 42, 19, 36, 34. Give your answer to 2 decimal places

    Answer: 31.14

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