A heart has a mass of about 450 kg. Express this in milligrams

450,000,000mg

Step-by-step explanation:

1kg = 1000g

1g = 1000mg

Let's find out how many mg is 1 kg. In order to do so, multiply 1000 by 1000.

Therefore, 1kg = 1000 (1000) mg = 1 000 000 mg

Now, let's solve the question by multiplying 1,000,000 by 450 since 450kg = 450 (1 kg).

450kg = 450 (1 000 000) mg = 450 000 000 mg

This is also equivalent to 4.50 * 10^8 mg.