Mental calculations

  • Days and Dates
    problem

    Days and dates

    Age
    11 to 14
    Challenge level
    filled star empty star empty star

    Investigate how you can work out what day of the week your birthday will be on next year, and the year after...

  • Two flowers with the numbers 15 and 16 on them
    problem

    Butterfly flowers

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    Can you find two butterflies to go on each flower so that the numbers on each pair of butterflies adds to the number on their flower?

  • Magnifying glass
    problem

    Number detective

    Age
    5 to 11
    Challenge level
    filled star empty star empty star

    Follow the clues to find the mystery number.

  • One Big Triangle
    problem

    One big triangle

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    Make one big triangle so the numbers that touch on the small triangles add to 10.

  • Number Round Up
    problem

    Number round up

    Age
    5 to 7
    Challenge level
    filled star filled star filled star

    Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

  • Buying a Balloon
    problem

    Buying a balloon

    Age
    7 to 11
    Challenge level
    filled star empty star empty star

    Lolla bought a balloon at the circus. She gave the clown six coins to pay for it. What could Lolla have paid for the balloon?

  • 4 Dom
    problem

    4 dom

    Age
    5 to 11
    Challenge level
    filled star filled star filled star

    Use these four dominoes to make a square that has the same number of dots on each side.

  • 2, 4, 6, 8
    problem

    2, 4, 6, 8

    Age
    5 to 7
    Challenge level
    filled star filled star filled star

    Using the cards 2, 4, 6, 8, +, - and =, what number statements can you make?

  • problem

    Two dice

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    Find all the numbers that can be made by adding the dots on two dice.

  • Domino Square
    problem

    Domino square

    Age
    7 to 11
    Challenge level
    filled star filled star empty star

    Use the 'double-3 down' dominoes to make a square so that each side has eight dots.