Second graders often become confused as they count from one decade to the next. In order to become fluent with operations in addition and subtraction, 2nd graders need to be able to move across decades. This activity includes a detailed activity, video and pictures of students at work, and an extension idea.

Concepts

counting, counting by 10, counting by 100, skip counting, addition, subtraction

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Additional Tags

betterlesson, betterlesson: crossing over 100, counting centuries, counting decades, numbers 100-1000

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Classroom Considerations

• Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
• The intended use for this resource is Instructional|practice

Common Core

2.NBT.A.2 2.NBT.A.1.b