Doubling - find doubles of numbers - easy math lesson for 2nd grade
To find a double of any number, just add it to itself. We practice this process for a bit, using even a visual model to find double of 27 without having to formally regroup.
Next, we fill in a doubles chart. Lastly, we solve word problems and use the doubles chart to help us.
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See also
Two-digit mental addition — online practice
Number rainbow & fact families with 12
Math Mammoth Grade 2 curriculum