Question

I will take a picture of the questions and send it.

Answer 1

The standard form of a number is just the number wrote normally, without operations.

So for questions 3 to 5, we have:

3:

`(8\cdot1)+(5\cdot(1)/(100))+(9\cdot(1)/(1000))=8+0.05+0.009=8.059_{}`

4:

`1+0.9+0.08+0.001=1.981`

5:

`\begin{gathered} \text{four hundred twenty five}\to425 \\ \text{fifty}-\text{two hundreds}\to0.52 \\ \text{four hundred twenty five and fifty}-\text{two hundreds}\to425.52 \end{gathered}`

Now, in order to write equivalent decimals, we can just add or remove zeros to the right of the decimal places.

6:

`\begin{gathered} 5.300\colon \\ 5.30\text{ and 5.3} \end{gathered}`

7:

`\begin{gathered} 3.7\colon \\ 3.70\text{ and 3.700} \end{gathered}`

8:

`\begin{gathered} 0.9\colon \\ 0.90\text{ and 0.900} \end{gathered}`

9:

`\begin{gathered} 2.50\colon \\ 2.5\text{ and 2.500} \end{gathered}`