Objective: Add and subtract tens from a multiple of 10.
In Lesson 11, students represent the addition of ten more with concrete objects and number bonds, first using the numeral and then writing as units of ten, as shown. After creating such number bonds for several examples, students notice that only the unit has changed (e.g., 3 bananas + 1 banana = 4 bananas, just as 3 tens + 1 ten = 4 tens). As students explore, they see that this relationship is present even when adding more than 1 ten. They come to realize that 2 tens + 2 tens = 4 tens, just as 2 + 2 = 4 (1.NBT.4). Students also explore this relationship with subtraction, seeing that 4 tens can be decomposed as 3 tens and 1 ten, and that 4 tens – 3 tens = 1 ten, just as 4 – 3 = 1 (1.NBT.6).
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