Hi year 7. This is the process for finding the rule for a number pattern, if the pattern is linear. We can use this for any patterns where the next number is going up by 3 or 4, or going down by any number like 2 (ie, 10,8,6,4,...). We can't use this for square patterns or ones where the next number goes up or down by a different number (ie, 1,3,7,13,21. This is going up by 2 then 4 then 6 then 8 etc).