You may also like

problem icon

More Mods

What is the units digit for the number 123^(456) ?

problem icon

N000ughty Thoughts

How many noughts are at the end of these giant numbers?

problem icon

Mod 3

Prove that if a^2+b^2 is a multiple of 3 then both a and b are multiples of 3.

Latin Numbers

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

If you haven't already done so, take a look at the shaded image at the bottom of the problem.

If the bottom row is 6N, what can you deduce about the first digit of N?

If the fifth row is 5N, what can you deduce about the last digit in that row?

What can you say about the last digit of 2N, 4N and 6N?