What is the sum of 9.72 * 108 and 1.93 * 107?

Order of operations rules require that we do the mult. before the addition.

Thus, the desired expression is 9.72 (108) + 1.93 (107)

10.4976 + 206.51

Combining these two products, we get 217.02 (after rounding down to 2 decimal places as 9.72 has been rounded)