Dear student, for this type of questions there is a common method.
Read it below;
For finding number divide 445, 542, 699 and leave remainder 6, we have to find the HCF of (445 -6), (542 - 6), (699 - 6)
Only thing you need to do is to find the hcf after subtracting the reminder.
Here just find the hcf of 439,536 and 693
Here, I face a little difficulty in finding the hcf. Please check the numbers are same itself (I think the numbers are changed.) .
If not, correct it and find the hcf.That is your answer.
Hope this helps.
Good luck.