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Cornerstone · Grades 3–5 Keystones #1 21 February 2021 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 February 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄3 + 3⁄5

    Answer: 14⁄15
  2. 2. Algebra Two-step equations

    Solve: 5x + 7 = 22

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

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

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

    Share 84 in the ratio 2:1

    Answer: 56 and 28
  5. 5. Statistics Mean

    Calculate the mean of: 18, 31, 21, 45, 30, 46

    Answer: 31.8

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