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Add three addends efficiently

Lesson 1 / 15

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Lesson outcome

I can add three addends efficiently.

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The order of the addends can be changed to make the addition easier The sum will be the same whichever pair of addends we add first. Finding a known fact or double to add first can be more efficient. Strategies used to be efficient might be different for everyone.

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This content is by Cashar and published under an open licence.