I can fluently add and subtract within 100. 67+28 = 63–32 = Place Value Commutative Relationship Strategy Property between Addition and Break 67 and 28 into I broke 67 and 28 tens and ones. into tens and ones. 60 Subtraction = + 7 + 20 + 8 6tens + 2tens 8tens I know 2 + 1 = 3 so + 1ten5ones 7ones 8ones = 60 + 20 = 80 = 1. And, I know 3 8tens 1 95 5ones + ten + = 80 + 7 = 87 + 3 = 6 so 6 3 = 3. – 87 + 8 = 95 The answer is 31. CCGPS.2.NBT.5
I can fluently add and subtract within 100. 67+28 = 63–32 = Place Value Strategy Break 67 and 28 into tens and ones. 6tens + 2tens = 8tens 7ones + 8ones = 1ten5ones 8tens + 1 ten + 5ones = 95 Commutative Property I broke 67 and 28 into tens and ones. 60 + 7 + 20 + 8 60 + 20 = 80 80 + 7 = 87 87 + 8 = 95 Relationship between Addition and Subtraction I know 2 + 1 = 3 so = 1. And, I know 3 + 3 = 6 so 6 – 3 = 3. The answer is 31. CCGPS.2.NBT.5
2nd_grade_kid_friendly_math_standards.docx