Question

How do you simplify `2.312- 1.0672+ 2.8`?

Answer 1

`4.0448`
Refer Below Chap...

Explanation:

If you're Confused with that Decimal Thingy, it's not a problem at all, just understand the concept..

Add first, then subtract.

`2.8` is the Same as `2.8000" "` (the Zeroes after the Significant Figure do not matter)

Now You can proceed....

`2.8000+2.3120=5.1120`

`5.1120-1.0672=4.0448`

Answer 2

`4.0448`

Explanation:

This involves only the addition and subtraction of decimals.

Align the numbers with the decimal points under each other.
Add first:

`color(white)(www.)2.3120`
`color(white)(ww)+ul2.8000" "larr` fill in place holders with `0s`
`color(white)(www.)5.1120" "larr` find the sum
`color(white)(ww)-ul1.0672" "larr` now subtract
`color(white)(ww.w)ul4.0448`