3rd grade math students make connections with geometric objects by classifying, describing, and comparing objects using coherent and clear mathematical diagrams and language. They justify problem-solving methods with valid and convincing mathematical arguments. With number and operations, 3rd grade math students focus primarily on addition and subtraction by developing additions and subtraction strategies that are built on adding and subtracting multiples of 10, solving addition and subtraction problems with two-digit and three-digit numbers, and finding combinations that add to 100. Subtraction strategies include adding up, subtracting a number in parts, and subtracting back. Addition strategies include changing the numbers in order to make them easier to add and breaking the numbers apart and then adding. Students in 3rd grade math will further develop their understanding of multiplication and division and develop their ability to apply their mathematical skills to problem solving.
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