It's Close Enough: Rounding and Estimation
Second graders round to the closest five, ten, and hundred. They use place-value concepts of grouping based upon powers of ten (thousandths, hundredths, tenths, ones, tens, hundreds, thousands) within the decimal number system.
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Addition And Subtraction And Mental Calculation Strategies
Students add two or more number using mental calculations. Given a set of single and double digit numbers, students use rounding and estimation to plan a strategy for adding and subtracting numbers without using pencil and paper.
1st - 2nd Math