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Cornerstone · Grades 3–5 Keystones #1 24 February 2021 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 24 February 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄4 + 2⁄3

    Answer: 11⁄12
  2. 2. Algebra Two-step equations

    Solve: 4x - 12 = 16

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Divide 208 in the ratio 1:1:2

    Answer: 52, 52 and 104
  5. 5. Statistics Mean

    Calculate the mean of: 36, 8, 21, 19, 33, 35, 31

    Answer: 26.1

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