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Let's start by calculating the total mass of 3.99 million flies and 47 million ants.

1. **Mass of 3.99 million flies**:
   - Each fly has a mass of 0.048 grams.
   - Total mass of flies = \( 3.99 \times 10^6 \) flies × 0.048 grams/fly.
   - Total mass of flies = 191,520 grams.

2. **Mass of 47 million ants**:
   - Each ant has a mass of \( 3.12 \times 10^{-3} \) grams.
   - Total mass of ants = \( 47 \times 10^6 \) ants × \( 3.12 \times 10^{-3} \) grams/ant.
   - Total mass of ants = 146,640 grams.

Now, comparing the masses:
- 3.99 million flies have a greater mass (191,520 grams) than 47 million ants (146,640 grams).
  
**Difference in mass**:
\( 191,520 - 146,640 = 44,880 \) grams.

### Justification:
Since the total mass of flies exceeds that of ants, the flies have a greater mass by 44,880 grams.

Would you like further details or have questions?  
Here are some related questions:

1. How does the mass of one ant compare to that of one fly?
2. What would happen if the number of ants and flies were equal?
3. What is the mass ratio of one fly to one ant?
4. If we had 10 million ants, how much would they weigh?
5. How many ants are needed to match the mass of 3.99 million flies?

**Tip**: When comparing large quantities, multiplying by the average mass directly helps simplify calculations.

Would 3.99 million flies or 47,000,000 ants have a greater mass? Approximately how much greater, in grams, would the greater mass be? Justify your answers.

Learn how to compare the total mass of 3.99 million flies to 47 million ants. This problem includes key mathematical concepts like multiplication and unit conversions, and provides a detailed step-by-step solution for calculating the mass difference. Suitable for students in Grades 6-8.

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