Chapter 1 Vocabulary:
estimate, expanded form, period, round, standard form, word form, compare, order, place value, digit, sum, regroup, addend, equal sign, greater than sign, less than sign, number line, difference, round
estimate, expanded form, period, round, standard form, word form, compare, order, place value, digit, sum, regroup, addend, equal sign, greater than sign, less than sign, number line, difference, round