Addition and subtraction

problem
How many eggs?

Age

7 to 11

Challenge level

Peter, Melanie, Amil and Jack received a total of 38 chocolate eggs. Use the information to work out how many eggs each person had.
problem
Special 24

Age

7 to 11

Challenge level

Find another number that is one short of a square number and when you double it and add 1, the result is also a square number.
problem
Zargon glasses

Age

7 to 11

Challenge level

Zumf makes spectacles for the residents of the planet Zargon, who have either 3 eyes or 4 eyes. How many lenses will Zumf need to make all the different orders for 9 families?
problem
Magic circles

Age

7 to 11

Challenge level

Put the numbers 1, 2, 3, 4, 5, 6 into the squares so that the numbers on each circle add up to the same amount. Can you find the rule for giving another set of six numbers?
problem
Arranging the tables

Age

7 to 11

Challenge level

There are 44 people coming to a dinner party. There are 15 square tables that seat 4 people. Find a way to seat the 44 people using all 15 tables, with no empty places.
problem
Number juggle

Age

7 to 11

Challenge level

Fill in the missing numbers so that adding each pair of corner numbers gives you the number between them (in the box).
problem
A rod and a pole

Age

7 to 11

Challenge level

A lady has a steel rod and a wooden pole and she knows the length of each. How can she measure out an 8 unit piece of pole?
problem
Make 100

Age

7 to 11

Challenge level

Find at least one way to put in some operation signs to make these digits come to 100.
problem
Next number

Age

7 to 11

Challenge level

Find the next number in this pattern: 3, 7, 19, 55 ...
problem
Amy's dominoes

Age

7 to 11

Challenge level

Amy has a box containing domino pieces but she does not think it is a complete set. Which of her domino pieces are missing?