These number sequences are missing digits! Each of the six has one missing number and scholars must figure out what it is. Here's the pattern, though: all of these sequences involve counting by 5s, 10s, and 100s. Learners add one of these numbers to determine the correct number, choosing it from a list of answers on the right. Encourage them to process verbally as they solve these. All the sequences have scholars count in chronological order, not backwards.