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Cornerstone · Grades 3–5 Keystones #1 13 February 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 13 February 2021 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄5 + 2⁄6

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

    Solve: 3x + 11 = 20

    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 160 in the ratio 2:1:2

    Answer: 64, 32 and 64
  5. 5. Statistics Mean

    Calculate the mean of: 38, 48, 22, 26, 39, 21

    Answer: 32.3

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