Expanding brackets — lesson. Mathematics CBSE, Class 6.

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Let us understand how brackets are used to expand the numbers and to do the calculation.

Example:

Consider

13 \times 106

\begin{array}{l} 13 \times 106 = (10 + 3) \times 106 \\ = 10 \times 106 + 3 \times 106 \\ = 10 \times (100 + 6) + 3 \times (100 + 6) \\ = 1000 + 60 + 300 + 18 \\ = 1378 \end{array}

Thus, through the expansion of brackets, we can easily obtain the product of numbers in some cases.

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9. Expanding brackets