Make a set of numbers that use all the digits from 1 to 9, once and
once only. Add them up. The result is divisible by 9. Add each of
the digits in the new number. What is their sum? Now try some other
possibilities for yourself!

Kids

Age 11 to 14 Challenge Level

There are at least twelve solutions to the addition sum

M

U

M

+

D

A

D

--

--

--

--

K

I

D

S

You have to replace the seven letters by seven numbers. How many
solutions can you find? How many solutions are there?