What comes next? Drill your new counters as they fill in a blank space when given two consecutive numbers. Each page features four sets of numbers, and learners fill in the third of the series. Differentiate by having beginners fill in the last number and more advanced learners fill in middle or first numbers. The eight pages provided are varied by difficulty, using numbers 2-20. Consider laminating and cutting out the cards so learners can reuse them by writing answers with dry erase marker.