Math: Addition Within 100 by Making 10

 First graders continue to grow their understanding of place value this week, applying what they learned about adding one-and two-digit numbers to any numbers within 100, with and without composing a ten (regrouping). Students apply the associative and commutative properties as they count on, add tens and tens, and add ones and ones. Students see that no matter which order they use to combine parts of the addends, the sum remains the same. They continue to use, interpret, and connect different methods and representations (including equations) that show a new unit of ten being composed from 10 ones.