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Linear Equations in One Variable

Find the give...

Question

Find the given multiplication :
39 x 7

(39 x 3 + 39 x 1 )

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(39 x 3 + 39 x 2 )

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(30 x 7 + 9 x 7 )

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(30 x 3 + 7 x 4 )

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Solution

The correct option is C (30 x 7 + 9 x 7 )
We can break the bigger number into smaller number to ease the multiplication.
so 39 can be written as 30 + 9 so
39 x 7 can be written as
(30+9) x 7
(30 x 7 + 9 x 7)

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