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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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slide1

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

slide5

Number Sense: Is 826 -

575 more or less than

300? Explain to your

partner how you can tell

without actually

subtracting.