Question

To get the product 1, we should multiply `8/21` by ______.

Options

• `8/21`

• `(-8)/21`

• `21/8`

• `(-21)/8`

Answer 1

To get the product 1, we should multiply `8/21` by `underlinebb(21/8)`.

Explanation:

Let the number be x.

`x xx 8/21 = 1`

Divide each side with `8/21`,

`x = 1/(8/21) = 21/8`

Thus, we should multiply `8/21` by `21/8` to get 1.