Question

Which is the estimate of 398 x 1.9?

Answer 1

800

Explanation:

When we say estimate, we must estimate the 2 numbers to their closest answer:

398- 400 when rounded to the nearest 100

1.9- 2 when rounded to the nearest whole number

So we get the estimate equation as: 400×2= 800

Answer 2

We know that:

• 
  `\tex\text{398 can be rounded to 400, as 398 is close to 400.}`
• 
  `\tex\text{1.9 can be rounded to 2, as 1.9 is close to 2.}`

This means that:

• 
  `398 * 1.9` ≈
  `400 * 2`

Simplifying "400 x 2"

• 
  `400 * 2`
  `= 800`

Thus, the estimate of 398 x 1.9 is about 800.