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Rounding & Estimation

Basic ideas of estimation and rounding are explored in this section. Mental computaton and estimation are useful in moving from one representation to another. While rounding to reach answers that makes sense is the underlying theme, students can be challenged to compare estimates and to make predictions.
 Related Resources

Interactive resources from our Math Tools project:
Math 4: Operations with Numbers
The closest match in our Ask Dr. Math archives:
FAQ: Rounding Numbers
NCTM Standards:
Number and Operations Standard for Grades 35
Access to these problems requires a Membership.

Baseball Trivia
 Judy Ann Brown

Math Fundamentals, difficulty level 2. How many runs do the Phillies have to score before the base runners have covered a mile?
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Can You Drink That Swimming Pool?
 Kristina Lasher

Math Fundamentals, difficulty level 3. Estimating the amount of water in a pool. About how long would it take
to drink that much water?
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Golden Gate Bridge *
 Claire Mead

Math Fundamentals, difficulty level 2. Find out how much wire was used in the two main cables of the Golden
Gate Bridge.
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Horton's Clover Hunt
 Lisa Lavelle

Math Fundamentals, difficulty level 4. Find out how fast Horton had to work picking clovers.
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Lunch Bunch Budgets
 Lisa Lavelle

Math Fundamentals, difficulty level 2. Determine the number of children needed for the lunch bunch budget to balance.
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The Mad Hatter's Gone!
 Leanne Gater

Math Fundamentals, difficulty level 4. Explore a coordinate plane and help the Cheshire Cat find his favorite cheese.
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Meters of Money
 Lisa Lavelle

Math Fundamentals, difficulty level 2. Help Ms. Juncos's class determine the amount of money they will raise with this metric project.
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Nova Scotia Quilt
 Claire Mead

Math Fundamentals, difficulty level 3. Use the area of a rectangular bed quilt to determine its dimensions.
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Penny Space
 Lisa Lavelle

Math Fundamentals, difficulty level 4. Determine the space needed to store a million pennies.
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Pushing Pennies
 Lisa Lavelle

Math Fundamentals, difficulty level 3. Estimate the number of pennies that you can fit on a sheet of paper, then evaluate your estimate.
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Rounding Mountains
 Judy Ann Brown

Math Fundamentals, difficulty level 2. Use estimated figures to determine the maximum and minimum differences between the heights of two mountains.
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School Spirit
 Kristina Lasher

Math Fundamentals, difficulty level 1. Do a little estimating to determine how much money is needed to buy school spirit items.
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The Twelve Percents of Christmas
 Lisa Lavelle

Math Fundamentals, difficulty level 2. Calculate the percentages of the total gifts received on each of the twelve days of Christmas.
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