This file is a set of vocabulary words commonly used in teaching place value, addition, and subtraction. In the developmental activities of teaching Mathematics for children, one of the activities is unlocking the vocabulary words. Thus, the definitions of these words are essential. The set also includes the words ESTIMATE, COMPATIBLE NUMBERS and ROUNDING. The words are Common Core aligned and could be used as posters or visual aids while teaching the subject matter.Thanks for dropping by! Enjoy