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Cornerstone · Grades 3–5 Keystones #1 21 September 2014 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 September 2014 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄7 + 5⁄6

    Answer: 65⁄42
  2. 2. Algebra Two-step equations

    Solve: 3x - 5 = 25

    Answer: x = 10
  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

    Divide 243 in the ratio 4:1:4

    Answer: 108, 27 and 108
  5. 5. Statistics Mean

    Calculate the mean of: 49, 49, 22, 13, 10, 31, 23, 7

    Answer: 25.5

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