## A student river - Section 2: Teaching the Lesson

A student river

# Crossing Over 100

Unit 6: Everything in Its Place
Lesson 12 of 14

## Big Idea: Students often become confused as they count from one decade to the next. In order to become fluent with operations in addition and subtraction, students need to be able to move across decades.

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Standards:
55 minutes

### Beth McKenna

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