“kilo-“ means “thousand.” A kilogram is 1,000 grams.
5 kg = 5,000 g
5,000 g × (1 pizza)/(300 g) = 5,000/300 pizzas = 16⅓
16 pizzas
False, it's the other way around: you divide the numerator by the denominator.
For example, to evaluate
you divide 8 by 15:

6 x 532 in expanded form is 6 x 500 + 30 + 2
25 less than 5 = 5 - 25
the answer is A. 5 - 25
Less than = subtraction
so the equation means 5 -(less than) 25
the correct answer is 5 - 25
Hope this helps!