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Lesson 2-3: Estimating Sums and Differences

Lesson 2-3: Estimating Sums and Differences. Power Lines on White Boards. Objective: Use rounding to estimate sums and differences. Math Understanding: There are different ways to estimate sums and differences. Most involve replacing numbers with other numbers that are

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Lesson 2-3: Estimating Sums and Differences

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  1. Lesson 2-3: Estimating Sums and Differences Power Lines on White Boards Objective: Use rounding to estimate sums and differences. Math Understanding: There are different ways to estimate sums and differences. Most involve replacing numbers with other numbers that are close and easy to compute mentally. Model estimating sums and differences Why we are not using Front-end estimation Practice on White boards Estimation strategies worksheet

  2. Number Sense: Is 826 - 575 more or less than 300? Explain to your partner how you can tell without actually subtracting.

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