Welcome to Number Smart ADVANCED Subitizing—Recognizing Multiples! Subtilizing is the immediate recognition of a quantity. It builds number sense and strengthens knowledge of number facts with meaning, not just memorization. Included are slides with various patterns WITHIN patterns of dice, fingers, coins, dominoes, tally marks and ten frames. This set contains over 650 visuals from 2 x 2 through 10 x 10!