Objective: Interpret two-digit numbers as tens and ones, including cases with more than 9 ones.
Lesson 23 focuses on taking interpretations of two-digit numbers a step further, having students interpret numbers such as 25 as 1 ten and 15 ones as well as 2 tens and 5 ones and as 25 ones. Working with this concept supports student understanding in the next lessons, when students add pairs such as 14 + 16 and initially make 2 tens and 10 ones.
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