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Examples:

                 0.000 001 g
A 5 μg to g: 5 μg × —————   =   0.000 005 g
                    1 μg
                                           0.000 000 001 m
B 42,000,000,000 nm to m: 42,000,000,000 nm × ————————      =   42 m
                                               1 nm
                                         1 μL
C 0.000 003 6 L to μL: 0.000 003 6 L ×  ————————      =   3.6 μL
                                      0.000 001 L

Generally speaking, when you convert a number expressed using a smaller unit into a number expressed using a larger unit the number will get smaller (see examples A & B).

Also, when you convert a number expressed using a larger unit into a number expressed using a smaller unit the number will get bigger (see example C).

One last note: recognize the value of the prefixes when dealing with numbers like those in examples A & B. Who wants to write all those zeros when you can assume they are there just by knowing how small/large the prefix makes the base unit?

1. 5,679 g to kg
2. 3.489 g to mg
3. 4,002 μg to ng

4. 4.392 L to mL
5. 0.000 003 45 L to nL
6. 1,234 μL to mL

 

7. 1.2 Gg to g
8. 1,305 mg to g
9. 12,049 fm to pm
10. 1.049 μm to nm
11. 0.42 cm to μm
12. 14 Mm to m
13. 16 km to dm
14. 15.7 Gg to Mg
15. 89 L to mL

16. 1.3 km to dm
17. 0.056 kg to cg
18. 53,034,120 mL to L
19. 5,409 fL to nL
20. 432 nm to mm
21. 78,000,000 nL to mL
22. 45,000 mL to L
23. 54 cm to m
24. 187 dm to km