Nick,
What can you say about the difference of the two given numbers? (If it is not obvious what this means, give yourself an easier problem to practice with: 394 and 317 are divided by a 1digit number and the 1digit remainder is the same in each case; find the divisor. So 394317 = ?. What are the divisors of this difference? Which divisor is a single digit? These two numbers (394 and 317) must leave the same remainder after division by 7 since their difference is divisible by 7.)
Chris and Sue
