MATH STRAND VII
ESTIMATION AND MENTAL COMPUTATION
22. Apply concept of place value in making estimates in addition and subtraction using front-end digits.
This outcome includes the understanding of front-end estimation for both addition and subtraction. The front-end strategy provides a means of arriving at an estimate quickly and easily by using the leading, or front-end digits, to obtain an initial estimate and making adjustments to refine the estimate. Items will emphasize the initial estimate and not require adjustments be made. Use of the strategy will require an application of place value.
23. Round numbers and use multiples of ten to estimate sums, differences, and products and discuss whether estimates are greater than or less than an exact sum or difference.
Items testing this outcome may require the student to round numbers and use multiples of ten to estimate sums, differences, and products; some items may have the student determine whether an estimate is greater than or less than a given sum.
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