Problem / game
First name
Noah
School
St Augustine's Catholic Primary School
Country
Age
10
The multiple of 1 has to be one less than a multiple of 2, and that M2 (multiple of 2), has to have a digit sum of 2, 5, or 8. the M3 has to also be one less than M4. The M4 has to end in 4, as it can't end in 9 as the last digits of M4s alternate in the pattern of 4, 8, 2, 6, 0. With this we know the M1s have to end in 1 because if you go three back, you are meant to get an M1. So 121, 122, 123, 124, and 125 is my answer.