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Cornerstone · Grades 3–5 Keystones #1 17 September 2011 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 17 September 2011 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄6 + 1⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 3x + 15 = 45

    Answer: x = 10
  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 48 in the ratio 3:1

    Answer: 36 and 12
  5. 5. Statistics Mean

    Calculate the mean of: 36, 32, 5, 36, 29, 15

    Answer: 25.5

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