This is another puzzle that is easy to state, but is a bit tricky to solve.
If you take the five digits 1, 2, 3, 4 and 5 you can make a multiplication sum such as 12 x 345 = 4,140. But this is far from the largest product that you can produce in this way. Your challenge is to find the highest result from a sum of this form using these five digits.
What is the largest number you can make?
The largest that we can find is 52 x 431 = 22,412
Can you do better?