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Cornerstone · Grades 3–5 Keystones #1 22 January 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 22 January 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄6 + 1⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 6x + 13 = 31

    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

    Divide 261 in the ratio 4:2:3

    Answer: 116, 58 and 87
  5. 5. Statistics Mean

    Calculate the mean of: 26, 20, 46, 34, 12, 47, 14

    Answer: 28.4

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