Arithmetic Grade Two
Lesson One hundred forty-two: Addition and Multiplication
Multiplication can be thought of as a short cut for adding the same number
over and over. Consider this example:
Here we added four fives for a sum of 20. We can translate this addition
problem to a multiplication problem like this:
Here's another example:
Here we add three fours for a sum of 12. We can write this as a
multiplication problem like this:
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