Question

What is `45.8+ 1.005`?

Answer 1

46.8

Explanation:

45.8 is known to only the nearest 1/10 (.1). The hundredths, and thousandths places are not known. The hundredths place could be any number from 0-4 that would round down. The thousandth place could be any number from 0-9

1.005 is known to the nearest 1/1000 (.001)

Adding an unknown value int the 1/1000th place to .005 results in an unknown value.

The answer can only be known to the nearest tenth (0.1) became that is the smallest value that is actually known.

Answer 2

`46.805`

Explanation:

The difficulty here is that you are adding decimals with different numbers of decimal places. Be sure to align the numbers with the decimal points underneath each other.

Then you will be adding digits with the same place value together.

`color(white)(xx..)45.8`
`color(white)(xxx)ul(+1.005)`
`color(white)(xx..)ul(46.805)`
`color(white)(xxx..)uarr`
The decimal points are all under each other.