Lesson: Challenging Arithmetic - 02
Factors
[Page 2 of 30]
Introducing Factors, Multiples, And Divisibility
Factors are the positive integers that divide evenly into a given number. For example, 3 is a factor of 12. Because 3 divides 12 evenly. On standardized tests factors are sometimes called divisors.
Being able to list all the factors of a number — especially the prime factors — will give you an edge on test day.
Video - Factors of a Number
The easiest way to come up with all of the factors of a number is by coming up with "factor pairs," starting with 1 and the number, then working your way up until the numbers start to repeat. Let's see how to do this.
List all of the factors of 30.
| 1 x 30 | Start with 1 and the number. |
| 2 x 15 | |
| 3 x 10 | Work your way up. |
| 5 x 6 | |
| 6 x 5 | Stop when the numbers repeat. |
All of the factors of 30 are {1, 2, 3, 5, 6, 10, 15, 30}.
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Test Prep Lessons With Video Lessons and Explained MCQ
Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.
Each exam has different types of math sections. The sections may be called Mathematics or Arithmetic Problem Solving. In the math section of the exam, you will be tested on basic math skills such as addition, subtraction, multiplication, and division. Some sections may include fractions, decimals, graphs and percentages. All questions will be a multiple choice format. The amount of math questions on each test will vary.