Mental calculations

  • The Tall Tower
    problem

    The tall tower

    Age
    5 to 7
    Challenge level
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    As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

  • Mind Reading
    problem

    Mind reading

    Age
    11 to 14
    Challenge level
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    Think of a number, add one, double it, take away 3, add the number you first thought of, add 7, divide by 3 and take away the number you first thought of. You should now be left with 2. How do I know?
  • A Square of Numbers
    problem

    A square of numbers

    Age
    7 to 11
    Challenge level
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    Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?

  • problem

    The Brown family

    Age
    5 to 7
    Challenge level
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    Use the information about Sally and her brother to find out how many children there are in the Brown family.

  • problem

    Ladybirds in the garden

    Age
    5 to 7
    Challenge level
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    In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?

  • content-03-01-cupboardlove2-sol1.gif
    problem

    Transformations tables

    Age
    7 to 11
    Challenge level
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    These grids are filled according to some rules - can you complete them?
  • Got It
    problem

    Got it

    Age
    7 to 14
    Challenge level
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    A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

  • Flip Flop - matching cards
    problem

    Flip flop - matching cards

    Age
    5 to 11
    Challenge level
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    Practise your number bonds whilst improving your memory in this matching pairs game.

  • Sealed Solution
    problem

    Sealed solution

    Age
    7 to 14
    Challenge level
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    Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?