Easy Addition Facts Worksheet Page 33
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75A33
Hard Addition Facts
UNIT 2
The Essentials
The hard facts will take a longer time to teach than the easy facts. One of the main
ideas in the hard facts is working “through ten.” Ten is a key way to think about
addition and subtraction facts that involve numbers in the teens. As you will see,
the ten frame is useful for communicating a strategy like “make ten.” Again, we
encourage you to stress the principle of commutation. In other words, show
students that 8 + 2 = 2 + 8. Showing students that you can “flip over” addition facts
will save them a great deal of time, and it will encourage flexible thinking.
Make Ten Fact 8 + 4 = 8 + 2 + 2
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