Question

Work out the missing value in the estimation below
82 x 19 ≈ 80 x ?

Answer 1

19.475 <----- this is the exact answer, I don't know what you need to round to

Step-by-step explanation:

82 x 19 = 1,558

1,1558 / 80 = 19.475

Hope this helps! :)

Answer 2

The missing value in the estimation 80 x ? to approximate 82 x 19 is 20, since 80 multiplied by 20 is 1600, which is close to the actual product of 82 x 19, which is 1558.

Step-by-step explanation:

To approximate the product of 82 x 19, we can round 82 to 80, which is a more manageable number for mental calculation. After rounding, we want to estimate the product using the number closest to 19 that will give us a similar estimate when multiplied by 80. The original expression rounds to 80 x ? and we're looking for the missing value that would approximate the result of 82 x 19.

Since the nearest multiple of 10 to 19 is 20, let's try multiplying 80 by 20:

80 x 20 = 1600.

This is a close estimation to 82 x 19 which is 1558, meaning that the missing value in the estimation 80 x ? is approximately 20.