List

Algebra

Diagonal Sums
problem
Favourite

Diagonal Sums

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

In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?

Price Match
problem
Favourite

Price Match

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

Can you find pairs of differently sized windows that cost the same?

Different Deductions
problem
Favourite

Different Deductions

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

There are lots of different methods to find out what the shapes are worth - how many can you find?

Two and Two
problem
Favourite

Two and Two

Age
7 to 16
Challenge level
filled star filled star filled star

How many solutions can you find to this sum? Each of the different letters stands for a different number.