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In this lesson, we will learn how to use facts about doubles to add two consecutive numbers whose sum is within 20.
Q1:
Which expression is equal to 6 + 5?
Q2:
Notice that 3 is one less than 4.
So the answer to 4 + 3 is one less than the answer to 4 + 4 .
If 4 + 4 = 8 , which of the following is equal to 4 + 3 ?
Q3:
Use
to find
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