Question

Estimate.15.12 + 78.88A.90B.93C.95D.100

Answer 1

We want to estimate the following sum

`15.12+78.88`

To do so, we just need to get each term of the sum to the closest multiple of 10.

`\begin{gathered} 15.12\approx20 \\ 78.88\approx80 \end{gathered}`

Then, we have

`15.12+78.88\approx20+80=100`

The answer is option D.