1. What will be the result if we add:

a) the smallest three-digit and the largest two-digit number;

b) the smallest odd one-digit and the largest even two-digit number.
a) The smallest three-digit number is 100, and the largest two-digit number is 99.

$$
100+99=199
$$

b) The smallest odd one-digit number is 1, and the largest even two-digit number is 98.

$$
1+98=99
$$

Answer: a) 199 ; b) 99 .