The students are currently applying their understandings of place value to modelling and solving addition and subtraction problems with and without regrouping. Practice can build confidence, and below is a link to a good site for all operations and basic facts where students can choose the complexity of the problem.
Mental math can help us to determine if an answer is reasonable or not. Rounding numbers, for example, allows us to add two numbers with relative ease in order to estimate a sum. If I see 786 + 422, I can think 800 + 400 and estimate the sum will be close to 1200. When I carry out the operation, I find that the actual sum is 1208. This gives me confidence in my answer. The other link below gives students practice in rounding. We will be focusing on strategies to help students confidently round to the nearest 10, 100 or 1000.
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AuthorMr. Long Archives
March 2019
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