**Expanded notation** is a way to write a number as the

sum of the value of each digit based on its place value.

Multiply each digit by its place value.

The value of the 1 in the hundreds place is 1 × 100.

The value of the 1 in the tens place is 1 × 10.

The value of the 8 in the ones place is 8 × 1.

The value of the 4 in the tenths place is 4 × $\frac{1}{10}$.

The value of the 4 in the hundredths place is 4 × $\frac{1}{100}$.

The value of the 6 in the thousandths place is 6 × $\frac{1}{\mathrm{1,000}}$.

So, the number in expanded notation is

1 × 100 + 1 × 10 + 8 × 1 + 4 × $\frac{1}{10}$ + 4 × $\frac{1}{100}$ + 6 × $\frac{1}{\mathrm{1,000}}$.

First, multiply.

2 × 100 = 200

8 × 10 = 80

6 × 1 = 6

9 × $\frac{1}{10}$ = 0.9

2 × $\frac{1}{100}$ = 0.02

8 × $\frac{1}{\mathrm{1,000}}$ = 0.008

Then, add.

200 + 80 + 6 + 0.9 + 0.02 + 0.008 = 286.928