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Cornerstone · Grades 3–5 Keystones #1 13 October 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 13 October 2020 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄5 + 1⁄3

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

    Solve: 2x - 15 = -5

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 104 in the ratio 3:2:3

    Answer: 39, 26 and 39
  5. 5. Statistics Mean

    Calculate the mean of: 47, 30, 22, 25, 16, 31

    Answer: 28.5

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