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Cornerstone · Grades 3–5 Keystones #1 8 September 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 8 September 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄4 + 4⁄5

    Answer: 21⁄20
  2. 2. Algebra Two-step equations

    Solve: 7x + 15 = 71

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 9cm and 40cm

    Answer: 41cm
  4. 4. Ratio Sharing in a ratio

    Share 55 in the ratio 1:4

    Answer: 11 and 44
  5. 5. Statistics Mean

    Calculate the mean of: 27, 5, 34, 46, 43, 47, 39, 35

    Answer: 34.5

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