This easy worksheet opens with tracing the words fives, tens, twos, skip, count, and pair so kids hear the names of the patterns as they write them. Part B then drops them into four short sequences with the missing number in different positions, such as 20, 30, 40, ___, 60, the early 2s pattern 2, 4, ___, 8, 10, and a stretch into the new hundreds with 70, 80, 90, 100, ___.

Part C ends with three true-or-false statements that test tricky decade boundaries, including whether 100, 110, 120 counts correctly by 10s and whether 10, 12, 15 is a valid count by 2s. A solid second pass for kids who finished the first easy sheet.