Remember we are looking for the answer choice which is false.
(a)
2(2) + 2(2) = 2(4), or 4 + 4 = 8. True. Eliminate.
(e) 2 –2 = 2(4), or 0 = 8. False.
If you have enough time, you may want to verify that the other answer choices are true
just to make sure you didn’t make a mistake. 2 – 2 = 0, or 0 = 0. True.
(d) 2 = 4/2, or 2 = 2. True.
(b)
2 – 4 = 2 –4, or –2 = -2. True.
When plugging numbers into a problem,
choose numbers that are easy to work with.
This depends, however, on the problem. Usually small numbers are easier to work with
than large numbers, especially if there are exponents involved. When exponents are
involved, choose numbers like 2 or 3; 0 and 1 have special properties that may make it
more difficult to recognize the answer.
Small numbers are not always the best though. When you’re working with percentages,
10 and 100 are easy numbers to work with. In a problem involving minutes or seconds,
60 may be the easiest number to work with. Look for clues in the problem to determine
which numbers to use.
Example 8:
A street vendor has just purchased a carton containing 250 hot dogs. If the
carton cost
x
dollars, what is the cost in dollars of 10 of the hot dogs?
(a) x/25
(b) x/10
(c) 10x
(d) 10/x
(e) 25/x