Grade 2 Big Idea:
Development of computational fluency in addition and subtraction with numbers to 100 requires an understanding of place value
Vocabulary: add/subtract, sum, difference, compose, decompose, regrouping
Number bonds for decomposing number into 10s and 1s and vice versa
Grade 3 Big Idea:
Development of computational fluency in addition, subtraction, multiplication and division of whole numbers requires flexible decomposing and composing
Vocabulary: add/subtract, sum, difference, compose, decompose, place value, arrays, equal grouping, repeated addition, skip counting
References:
Adding & Subtracting Double Digits with Regrouping
Video: Subtraction with Regrouping
Vocabulary: digit, add, subtract, sum, difference, compose & decompose, addend & minuend
