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Lesson Plan

3. Determining which values will round to a specific number (FP)

teaches Common Core State Standards 111.5.2.C
teaches Common Core State Standards 111.6.2.D
teaches Common Core State Standards 3.NS.9
teaches Common Core State Standards CCSS.Math.Content.3.NBT.A.1
teaches Common Core State Standards CCSS.Math.Practice.MP8
teaches Common Core State Standards MAFS.3.NBT.1.1
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Lesson objective: Determine which possible numbers will round to a given value.

This lesson helps to build procedural skill with rounding. A number line is used here because it supports the concept that numbers that are close to benchmark numbers can round to those benchmark numbers. This work develops students' understanding that rounding is based on place value and can be used to substitute close benchmark numbers.

Students engage in Mathematical Practice 8 (Look for and express regularity in repeated reasoning) as they are repeatedly exposed to rounding numbers conceptually using number lines and/or hundred charts. Students will notice the conventions of when numbers round forward or back determined by their location and distance from each other.

Key vocabulary:

  • benchmark number
  • rounding
Related content

Appears in

Developing strategies for addition and subtraction

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