You may also like

Double Digit

Choose two digits and arrange them to make two double-digit numbers. Now add your double-digit numbers. Now add your single digit numbers. Divide your double-digit answer by your single-digit answer. Try lots of examples. What happens? Can you explain it?

Number Detective

Follow the clues to find the mystery number.

Six Is the Sum

What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?

Diagonal Sums

Age 7 to 14 Challenge Level:

How do the numbers at the corners of the square compare with each other?
For example, what is the difference between the two numbers at the "top" corners of the square? And the difference between the two numbers at the "bottom" corners of the square?
You may like to print off this 100 square to try out some different squares of numbers.