Objective: Add a multiple of 10 to any two-digit number within 100.
Lesson 11 scaffolds students to add a multiple of 10 to any two-digit number, such as 64 + 30 (1.NBT.4). While some students may initially apply their ability to mentally add 10 by counting on by tens (64, 74, 84, 94), students also decompose 64 into 60 and 4 to solve as shown to the right.
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