Choose the correct expanded form of 129 from the following options:

100 × 1 + 10 × 2 + 9

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100 × 1 + 10 × 9

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100 × 1 + 10 × 9 + 2

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100 × 2 + 10 × 1 + 9

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Solution

The correct option is A 100 × 1 + 10 × 2 + 9
To write the expanded form of number 129, multiply 1 by 100, 2 by 10 and 9 by 1.

129 = 100 × 1 + 10 × 2 + 1 × 9

= 100 × 1 + 10 × 2 + 9

Thus, the expanded form of 129 is: 100 + 20 + 9
So, option B is the correct answer.

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