Write the numbers in standard form from expanded notation.

To write these numbers in standard form, we need to add up all the parts. The easiest way is to line them up by their place value (hundreds, tens, ones, tenths, hundredths, thousandths) and combine them.

Here is the step-by-step solution for each problem:

1) $500 + 30 + 5 + 0.4 + 0.03 + 0.001$
* Whole numbers: $500 + 30 + 5 = 535$
* Decimals: $0.4 + 0.03 + 0.001 = 0.431$
* Combined: 535.431

2) $300 + 70 + 1 + 0.3 + 0.08 + 0.008$
* Whole numbers: $300 + 70 + 1 = 371$
* Decimals: $0.3 + 0.08 + 0.008 = 0.388$
* Combined: 371.388

3) $300 + 80 + 2 + 0.5 + 0.07 + 0.004$
* Whole numbers: $300 + 80 + 2 = 382$
* Decimals: $0.5 + 0.07 + 0.004 = 0.574$
* Combined: 382.574

4) $300 + 20 + 5 + 0.1 + 0.03 + 0.003$
* Whole numbers: $300 + 20 + 5 = 325$
* Decimals: $0.1 + 0.03 + 0.003 = 0.133$
* Combined: 325.133

5) $500 + 20 + 1 + 0.6 + 0.03 + 0.009$
* Whole numbers: $500 + 20 + 1 = 521$
* Decimals: $0.6 + 0.03 + 0.009 = 0.639$
* Combined: 521.639

6) $800 + 80 + 9 + 0.2 + 0.05 + 0.009$
* Whole numbers: $800 + 80 + 9 = 889$
* Decimals: $0.2 + 0.05 + 0.009 = 0.259$
* Combined: 889.259

7) $600 + 70 + 2 + 0.3 + 0.08 + 0.008$
* Whole numbers: $600 + 70 + 2 = 672$
* Decimals: $0.3 + 0.08 + 0.008 = 0.388$
* Combined: 672.388

8) $600 + 80 + 7 + 0.9 + 0.07 + 0.003$
* Whole numbers: $600 + 80 + 7 = 687$
* Decimals: $0.9 + 0.07 + 0.003 = 0.973$
* Combined: 687.973

9) $200 + 60 + 1 + 0.4 + 0.02 + 0.006$
* Whole numbers: $200 + 60 + 1 = 261$
* Decimals: $0.4 + 0.02 + 0.006 = 0.426$
* Combined: 261.426

10) $700 + 90 + 6 + 0.4 + 0.01 + 0.004$
* Whole numbers: $700 + 90 + 6 = 796$
* Decimals: $0.4 + 0.01 + 0.004 = 0.414$
* Combined: 796.414

11) $600 + 10 + 2 + 0.4 + 0.04 + 0.004$
* Whole numbers: $600 + 10 + 2 = 612$
* Decimals: $0.4 + 0.04 + 0.004 = 0.444$
* Combined: 612.444

12) $600 + 40 + 6 + 0.8 + 0.04 + 0.005$
* Whole numbers: $600 + 40 + 6 = 646$
* Decimals: $0.8 + 0.04 + 0.005 = 0.845$
* Combined: 646.845

13) $700 + 50 + 5 + 0.2 + 0.08 + 0.008$
* Whole numbers: $700 + 50 + 5 = 755$
* Decimals: $0.2 + 0.08 + 0.008 = 0.288$
* Combined: 755.288

14) $900 + 80 + 4 + 0.2 + 0.04 + 0.001$
* Whole numbers: $900 + 80 + 4 = 984$
* Decimals: $0.2 + 0.04 + 0.001 = 0.241$
* Combined: 984.241

15) $600 + 50 + 4 + 0.8 + 0.06 + 0.006$
* Whole numbers: $600 + 50 + 4 = 654$
* Decimals: $0.8 + 0.06 + 0.006 = 0.866$
* Combined: 654.866

Final Answer:
1) 535.431
2) 371.388
3) 382.574
4) 325.133
5) 521.639
6) 889.259
7) 672.388
8) 687.973
9) 261.426
10) 796.414
11) 612.444
12) 646.845
13) 755.288
14) 984.241
15) 654.866