Multiplication as repeat addition
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1. Question
Now, let us use the method of repeat addition to multiply.
21 x 3 can be written as:
21 + 21 + 21 = _____
When we add 21 three times, we get 63.
Now, try these. Add the numbers in your mind and answer.
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1. 16 x 4 can be written as + + + . So 16 x 4 = .
2. 33 x 3 can be written as + + . So 33 x 3 = .
3. 100 x 5 can be written as + + + + . So 100 x 5 = .
4. 8 x 3 can be written as + + . So 8 x 3 = .
5. 23 x 4 can be written as + + + . So 23 x 4 = .
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