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Elementary: Estimation

In grades 3-5, students learn to compute using basic number combinations and to solve related problems mentally, becoming fluent in adding, subtracting, multiplying, and dividing whole numbers. In so doing, they develop strategies for estimating the reasonableness of the results of computations that involve whole numbers, fractions and decimals. They learn when mental computation and estimation are appropriate, choosing their tools according to the context and nature of the computation.

Elementary Problems of the Week that allow students to practice their estimating skills are found below. These problems address the NCTM Number and Operations Standard for Grades 3-5 expectation that students should be able to compute fluently and make reasonable estimates.

To find sites about estimation on the Web, browse and search Estimation in our Internet Mathematics Library; to find elementary sites, go to the bottom of the page, set the searcher for late elementary level (3-5), and press the Search button. For questions about rounding numbers and place value, see the Elementary Level of the Ask Dr. Math archives: Place Value.

Access to these problems requires a Membership.

Irish Specials - Lisa Lavelle
active problem Math Fundamentals, difficulty level 3. Calculate the final bill for our St. Patrick's Day dinner last week. ... more>>

More Balloons - Lisa Lavelle
active problem Math Fundamentals, difficulty level 5. Here's a more difficult problem based on our balloon color preferences. ... more>>

Penny Space - Lisa Lavelle
active problem Math Fundamentals, difficulty level 4. Determine the space needed to store a million pennies. ... more>>

Presidential Timepieces - Mary DeYoung & class
active problem Math Fundamentals, difficulty level 4. Develop a sense of time by exploring presidential events. ... more>>

Pushing Pennies - Lisa Lavelle
active problem Math Fundamentals, difficulty level 3. Estimate the number of pennies that you can fit on a sheet of paper, then evaluate your estimate. ... more>>

Speeders, Beware! - Stephen Maurer (and Chief Brian Craig)
active problem Elementary, difficulty level 4. Evaluate the method the Swarthmore Borough Police Department uses for catching speeders. ... more>>

Video Viewing - Lisa Lavelle
active problem Math Fundamentals, difficulty level 3. Just how much television will Frank and Lisa watch? ... more>>

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