Unit 7, Lesson 21, Grade 2 icon
Unit 7, Lesson 21

Identify unknown numbers on a number line diagram by using the distance between numbers and reference points

EngageNY 60 min(s)Support for English Language Learners

In this lesson, students represent whole numbers as lengths on a number line. They identify unknown numbers by using mental benchmarks or reference points (e.g., 5, 10, 25, 50) and intervals of 1, 5, or 10. Problems increase in complexity as students use their understanding of place value and the distance between positions to label points.

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