Your job is to fill in the blank targets using all of the digits once. HINT: To find a multiple of 3, you can add all the digits together. If that number is a multiple of 3 then so is the larger number. Let's take 15 for example, 1 plus 5 is equal to 6. 6 is a multiple of 3. So 1002 is 1 + 0 + 0 + 2 = 3. 1002 is a multiple of 3 but 1003 would not be. Based on the NRICH activity https://nrich.maths.org/6342
Use each digit only once.