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

  1. 1. Number Adding fractions

    Add: 7⁄8 + 2⁄5

    Answer: 51⁄40
  2. 2. Algebra Two-step equations

    Solve: 3x - 9 = 36

    Answer: x = 15
  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

    Divide 60 in the ratio 2:2:1

    Answer: 24, 24 and 12
  5. 5. Statistics Mean

    Calculate the mean of: 20, 16, 13, 32, 39, 20

    Answer: 23.3

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