The sum of $3.73 + 9.74 = 13.47$.

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Here are 5 related questions to expand on this:

1. What is $3.73 - 9.74$?
2. How would you calculate $3.73 \times 9.74$?
3. What is $9.74 \div 3.73$?
4. Can you express the sum $3.73 + 9.74$ as a fraction?
5. What is the average of 3.73 and 9.74?

Tip: When adding decimals, it's helpful to align the decimal points to avoid mistakes.