## Common Core State Standards for Mathematics

Grade(s) 4 resources related to the following standard:
Number and Operations in Base Ten
Generalize place value understanding for multi-digit whole numbers.
3. Use place value understanding to round multi-digit whole numbers to any place.

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This interactive Shockwave applet provides practice in rounding numbers. Each level presents 10 grids of numbers, each with a specific challenge. Users select the number in the grid that is rounded correctly. Level 1 includes rounding whole numbers and numbers of one decimal place to the nearest unit, 10 or 100. Level 2 involves rounding off numbers with up to six decimal places. Level 3 includes rounding to a number of significant digits for whole numbers and decimals. A Key Ideas window explains how to round.
Activity, Interactive Media
In this reply to a teacher's inquiry in The Math Forum's Teacher2Teacher service, Associate Gail Englert describes her technique for helping students understand how to round numbers. Her story context and follow-up lesson with number lines give meaning to the concept of halfway and provide a conceptual structure that students can transfer to other situations. The page includes a link to subsequent discussions by others on the topic of rounding.
Instructional Strategy, Reference Materials, Community
Grade Level: 2, 3, 4, 5