Mr. Khan uses a number line to show how to round to the nearest thousand using a six-digit number. Sal Khan was the recipient of the 2009 Microsoft Tech Award in Education. (02:28)

This song from the PBSkids science series, Sid the Science Kid, talks about how to estimate the number of large sets of objects. Images like flocks of geese, a jar of jelly beans, and sunflowers, etc. are shown and the singer tells how she reaches h...er "best guess" to get an estimated amount. (1:46)[more]

In this video students learn to round a number to a given place using the following steps. First, find the digit in the rounding place. Next, look at the digit to the right of the rounding place. If the digit to the right of the rounding place is les...s than 5, round down, which means that the digit in the rounding place stays the same, and all digits to the right of the place become zero. If the digit to the right of the rounding place is 5 or greater, round up, which means add 1 to the digit in the rounding place, and all digits to the right of the rounding place become zero.[more]

One way to estimate is by rounding a number. Rounding is a great way to make numbers easier to work with. Numbers are often rounded to the nearest ten, hundred, or thousand. Learn more about estimation and rounding with this step-by-step, interact...ive video from StudyJams. A short, self-checking quiz is also included with this link.[more]

This video explains how to estimate using addition, subtraction,
multiplication, and division math problems and by using rounding and
compatible numbers. This is geared for middle school students in the 6th grade.

This short lesson demonstrates how to round a whole number to the tens and hundreds place and how to round a decimal to the tenths and hundredths place. The instructor writes out each example as she explains how to find the correct answers.

From YouTube, produced by Hazelwood Schoolthis video

This video is geared for fifth grade. It explains math concepts and problem solutions orally and in writing and helps students to understand the concept of rounding whole numbers and estimation. Problems are given for students to solve by using pro...blem solving strategies. (01:48)[more]

This slide show tutorial is on the subject of estimation. Estimation is defined and practice is given estimating how many small shapes will fit inside a larger shape.

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