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Cornerstone · Grades 3–5 Keystones #1 15 September 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 15 September 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄7 + 1⁄7

    Answer: 2⁄7
  2. 2. Algebra Two-step equations

    Solve: 3x + 3 = 39

    Answer: x = 12
  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 189 in the ratio 4:3:2

    Answer: 84, 63 and 42
  5. 5. Statistics Mean

    Find the mean of: 20, 16, 2, 16

    Answer: 13.5

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