Write in each of the following as a single fraction or mixed number in its simplest form:
1. 3.9
2. 0.62
3. 2.45
4. 0.0018
1. 3.9 = 39/10
2. 0.62 = 31/50
3. 2.45 = 49/20
4. 0.0018 = 9/5000
1. 3.9
2. 0.62
3. 2.45
4. 0.0018
2. 0.62 = 31/50
3. 2.45 = 49/20
4. 0.0018 = 9/5000