Addition and subtraction

  • Starfish Spotting
    problem

    Starfish spotting

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

    How many starfish could there be on the beach, and how many children, if I can see 28 arms?

  • Domino Join Up
    problem

    Domino join up

    Age
    5 to 7
    Challenge level
    filled star filled star empty star
    Can you arrange fifteen dominoes so that all the touching domino pieces add to 6 and the ends join up? Can you make all the joins add to 7?
  • problem

    Birthday cakes

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

    Jack's mum bought some candles to use on his birthday cakes and when his sister was born, she used them on her cakes too. Can you use the information to find out when Kate was born?

  • Heads and Feet
    problem

    Heads and feet

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

    On a farm there were some hens and sheep. Altogether there were 8 heads and 22 feet. How many hens were there?

  • Mrs Beeswax
    problem

    Mrs Beeswax

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

    In how many ways could Mrs Beeswax put ten coins into her three puddings so that each pudding ended up with at least two coins?

  • Routes 1 and 5
    problem

    Routes 1 and 5

    Age
    5 to 7
    Challenge level
    filled star filled star empty star
    Find your way through the grid starting at 2 and following these operations. What number do you end on?
  • problem

    Ladybirds in the garden

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

    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?

  • Eggs in Baskets
    problem

    Eggs in baskets

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

    There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. How many eggs are in each basket?

  • Ring a Ring of Numbers
    problem

    Ring a ring of numbers

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

    Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.

  • Domino Pick
    problem

    Domino pick

    Age
    5 to 7
    Challenge level
    filled star filled star empty star
    Are these domino games fair? Can you explain why or why not?