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# Tip #9 to Get a Top SAT Math Score

By McGraw-Hill Professional
Updated on Sep 10, 2011

Here are three more math vocab terms. Memorize them, practice using them, and remember to underline them in questions. That will avoid heaps of careless errors.

Factors—'numbers that divide into a number evenly (i.e., without a remainder).

Example: The factors of 48 are 1, 2, 3, 4, 6, 8, 12, 16, 24, 48.

When asked for the factors of a number, make a list of pairs like the ones shown above. This eliminates the possibility of missing any.

Prime factors—'the factors of a number that are also prime numbers. (Remember, a prime number is a number whose only factors are 1 and itself.)

Example: The prime factors of 48 are 2 and 3. These are the factors of 48 that also happen to be prime numbers.

Multiples—'all the numbers that are divisible by a certain number.

Example: The multiples of 3 are 3, 6, 9, 12, 15, 18, 21, etc.

Let's look at this question:

Solution: To complete this question, we factor 100 just as we factored 48 above.

Then we circle any prime numbers in the list. The numbers 2 and 5 are the only prime numbers in the list, so set P has 2 members.

### Easy

1. Each of the following is a factor of 120 EXCEPT
1. 3
2. 4
3. 5
4. 6
5. 7
2. Which of the following is an odd number that is a factor of 114 ?
1. 2
2. 13
3. 55
4. 57
5. 61
3. How many integer factors does the number 48 have?
1. None
2. 1
3. 3
4. 8
5. 10
4. ### Medium

5. If P is the set of all different, real number, prime factors of 48 that are also factors of 100, how many members does set P contain?
1. None
2. 1
3. 2
4. 3
5. 52
6. What is the lowest number that is a multiple of 10, 12, and 15 ?
1. 1800
2. 900
3. 120
4. 60
5. 30
7. ### Hard

8. If a, b, and c are different prime numbers, how many factors does ab2c have?
1. 3
2. 5
3. 9
4. 10
5. 12

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