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Next week, our third graders will continue working on addition strategies and begin studying their subtraction facts. By now students should be comfortable with at least one strategy for addition.
One strategy they have learned is Adding By Place Value. For example, to solve 184 + 235, students can add the hundreds first (100 + 200 = 300), then the tens (80 + 30 = 110) and finally the ones (4 + 5 = 9). Add your numbers to find the final answer - 300 + 110 + 9 = 419.
Another strategy is Breaking One Number Apart. To solve the same problem, 184 + 235, first add 184 + 200 = 384. Then add 384 + 30 = 414. Our students have been studying how to add groups of 10, so this step should be fairly easy. Finally, add 414 + 5 = 419.
Students will bring home some subtraction fact cards later in the week. It is expected that students are fluent with their subtraction facts by the end of third grade.
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It's sooooo important for students to be fluent with their addition and subtraction facts. Think of it like reading a book, if students are stumbling over the words and have to stop and sound out every word, they lose comprehension! Math facts are the same way... If students have to stop working to count out every fact they lose the "big idea" of the math problem they are trying to solve! Practice those math facts!!!
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