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Cornerstone · Grades 3–5 Keystones #1 20 January 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 20 January 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 7⁄10 + 1⁄10

    Answer: 4⁄5
  2. 2. Algebra Two-step equations

    Solve: 7x - 12 = 51

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 171 in the ratio 4:3:2

    Answer: 76, 57 and 38
  5. 5. Statistics Mean

    Find the mean of: 18, 3, 13

    Answer: 11.333333333333

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