Can you work out what a ziffle is on the planet Zargon?
48 is called an abundant number because it is less than the sum of
its factors (without itself). Can you find some more abundant
Find at least one way to put in some operation signs (+ - x ÷)
to make these digits come to 100.
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?
Explore Alex's number plumber. What questions would you like to
ask? Don't forget to keep visiting NRICH projects site for the
latest developments and questions.