Not necessarily. You could have done your multiplication wrong. Or in some cases, yes, you could have to use another skill. For example, you can't solve an optimization problem with addition, you need some calculus skills under your belt.
Answer:
the answer would be B the answer would be B
Simply multiply 45 by 2 and you get your answer which is 90 cookies
0.1 / 100 * 10 = 0.01 pounds
The answer is 0.6 because you divide 21 by 35 and get 0.6
