NRICH (University of Cambridge)
Find a factor of 248−1.
NRICH (University of Cambridge)
Can you put these products in order of size?
NRICH (University of Cambridge)
Jane accidentally multiplied by 54 instead of 45, and her answer was 198 too big. What number did she multiply 54 by?
NRICH (University of Cambridge)
Take a look at the multiplication square. The first eleven triangle numbers have been identified. Can you see a pattern? Does the pattern continue?
National Council of Teachers of Mathematics
Can you find the answer without a calculator?
