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Cornerstone · Grades 3–5 Keystones #1 26 April 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 26 April 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄8 + 1⁄3

    Answer: 23⁄24
  2. 2. Algebra Two-step equations

    Solve: 5x + 15 = 60

    Answer: x = 9
  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 63 in the ratio 3:4

    Answer: 27 and 36
  5. 5. Statistics Mean

    Calculate the mean of: 45, 17, 13, 19, 30, 20

    Answer: 24

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