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Cornerstone · Grades 3–5 Keystones #1 4 October 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 4 October 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄5 + 2⁄5

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

    Solve: 7x + 10 = 87

    Answer: x = 11
  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

    Divide 210 in the ratio 2:1:4

    Answer: 60, 30 and 120
  5. 5. Statistics Mean

    Find the mean of: 15, 19, 11, 9, 13

    Answer: 13.4

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