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Games, Ideas and Activities for Primary Mathematics, 2nd Edition by Mr. John Dabell

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Chapter 7

Number tricks

What a card

What a card is a great number mind-reading trick which uses quite simple numbers to produce impressive results.

Suitable for

KS2

Aims

  • To recognise numbers and their properties.
  • To investigate how a number trick works.

Players

  • Suitable for pairs, small groups or the whole class

Resources

  • Pencil and paper

What to do

  • Write the following rows of numbers on the board:
    Line A 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
    Line B 2 3 6 7 10 11 14 15 18 19 22 23 26 27 30 31
    Line C 4 5 6 7 12 13 14 15 20 21 22 23 28 29 30 31
    Line D 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31
    Line E 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
  • Ask children to look at the numbers carefully. Now ask someone ...

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