Sat Math Easy Practice Worksheet With Answer Key Page 10
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17SAT Math Easy Practice Quiz #2 Answers
7. C
(Estimated Difficulty Level: 2)
10. B
(Estimated Difficulty Level: 2)
First, you must know the first few prime numbers! I’ll
Every sequence has a rule which tells you how to get
every number in the sequence. In this problem, you are
be nice and give you the first few (2, 3, 5, 7, 11, . . .)
but memorize the first ten or so for the SAT.
given the sequence and you have to find the rule. As
with most “which of the following” questions, you need
To make this problem easy, plug in a prime number for
to go through the answers until you find the correct one.
n. Let’s say you chose n = 5. Then, 6n = 30. Since
Here, pick a number from the sequence and see which
30 is not odd, prime, a multiple of 12, or equal to 12,
rule gives the next number. For example, if you choose
answer C is correct.
12, then answer A gives 15, answer B gives 39, answer
C gives 149, answer D gives 15, and answer E gives 6.
Be careful when plugging in numbers: don’t just stop
The correct answer is B, since the next number in the
at the first “correct” answer. If you get more than one
sequence is 39.
answer that could be correct, you’ll have to pick another
number to figure out which of those answers is the right
If you started with 0, every rule in the answers gives
one. (For this question, if you use 2 as your first choice
the next term in the sequence (3), which is probably a
for n, then C, D, and E will all seem to be correct. A
bit annoying. Sorry about that; I can’t imagine how
bit mean of me, yes, but you’ll thank me later.)
that happened! Just forge ahead with another number
in the sequence until you get only one correct answer.
8. 20
(Estimated Difficulty Level: 2)
Make a list! Alternatively, when the list seems long, try
to see a pattern so that you don’t have to count every
single number. First, which numbers between 9 and 99
have an even tens digit? All the 20s, 40s, 60s, and 80s.
Now just look at the 20s. How many of those have odd
units (ones) digits? That would be 21, 23, 25, 27, and
29, which makes five numbers. It is the same for the
40s, 60s, and 80s, so the final answer is 5 × 4 = 20.
9. C
(Estimated Difficulty Level: 2)
In this problem, you have to count the number of com-
binations of Haley’s bills that add up to different dollar
amounts. Make a list!
$5 bills
$1 bills
Amount
0
1
$1
0
2
$2
1
0
$5
1
1
$6
1
2
$7
There are five different possible dollar amounts, making
C the correct answer.
pg. 10
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