To divide 72 by 4.5 manually, follow these steps:

1. Remove the decimal: To simplify the division, multiply both the dividend (72) and the divisor (4.5) by 10 to eliminate the decimal in the divisor. This gives: $\frac{72 \times 10}{4.5 \times 10} = \frac{720}{45}$

2. Perform the division: Now divide 720 by 45: $720 \div 45 = 16$

So, $72 \div 4.5 = 16$.

Would you like a detailed explanation or have any questions?

Here are some related questions for further practice:

1. What is 36 divided by 3.6?
2. How do you divide 81 by 4.5 manually?
3. What is 45 divided by 0.9?
4. How can you divide 60 by 7.5 manually?
5. What is the result of dividing 108 by 9?

Tip: When dividing by a decimal, multiplying both numbers by 10 or 100 to remove the decimal makes the division easier.