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Show young mathematicians that they are fully capable of mentally adding two-digit numbers. They start by solving 12 two-addend problems (all with two-digit numbers and aligned horizontally). There is no room to show work. Consider stopping here and prompting scholars to explain their methods. Did they utilize place value to make the addition easier? Next, they complete 12 three-addend equations. Learners practice using units with the next two sections which include money and measurement values. Consider numbering the 40 problems before copying to make review much easier.