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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 3-5

Access to these problems requires a Membership.

Baseball Trivia - Judy Ann Brown
teacher support active problem Math Fundamentals, difficulty level 2. How many runs do the Phillies have to score before the base runners have covered a mile? ... more>>

Can You Drink That Swimming Pool? - Kristina Lasher
teacher support active problem Math Fundamentals, difficulty level 3. Estimating the amount of water in a pool. About how long would it take to drink that much water? ... more>>

Chocolate, Orange, Mega-mint Swirl - Fitzgerald's Spring 2000 Class C
teacher support active problem Math Fundamentals, difficulty level 4. How many half-gallon cartons of ice cream can fit in the freezer? ... more>>

Horton's Clover Hunt - Lisa Lavelle
teacher support active problem Math Fundamentals, difficulty level 4. Find out how fast Horton had to work picking clovers. ... more>>

Lunch Bunch Budgets - Lisa Lavelle
teacher support active problem Math Fundamentals, difficulty level 2. Determine the number of children needed for the lunch bunch budget to balance. ... more>>

The Mad Hatter's Gone! - Leanne Gater
teacher support active problem Math Fundamentals, difficulty level 4. Explore a coordinate plane and help the Cheshire Cat find his favorite cheese. ... more>>

Meters of Money - Lisa Lavelle
teacher support active problem Math Fundamentals, difficulty level 2. Help Ms. Juncos's class determine the amount of money they will raise with this metric project. ... more>>

Nova Scotia Quilt - Claire Mead
teacher support active problem Math Fundamentals, difficulty level 3. Use the area of a rectangular bed quilt to determine its dimensions. ... more>>

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

Pushing Pennies - Lisa Lavelle
teacher support 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>>

Rounding Mountains - Judy Ann Brown
teacher support active problem Math Fundamentals, difficulty level 2. Use estimated figures to determine the maximum and minimum differences between the heights of two mountains. ... more>>

School Spirit - Kristina Lasher
teacher support active problem Math Fundamentals, difficulty level 1. Do a little estimating to determine how much money is needed to buy school spirit items. ... more>>

The Twelve Percents of Christmas - Lisa Lavelle
teacher support active problem Math Fundamentals, difficulty level 2. Calculate the percentages of the total gifts received on each of the twelve days of Christmas. ... more>>

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