Lesson: Challenging Arithmetic - 06
PEMDAS and Divisibility Checks
[Page 6 of 30]
To help determine whether one number is a factor of another number (i.e., whether it divides evenly into the other number), it's helpful to know the Rules of Divisibility. Do you know the rules for the following?
Video - Divisibility
Perfect Divisors
A number n is said to be divisible by another number say m, if when we divide n by m the remainder is zero.
| รท by |
If... |
Example |
| 2 |
its last digit is even |
Example |
| 3 |
its digits add up to a multiple of 3 |
Example |
| 4 |
its last 2 digits are a multiple of 4 |
Example |
| 5 |
its last digit is 0 or 5 |
Example |
| 6 |
it's a multiple of 2 and 3 |
Example |
| 8 |
its last 3 digits are a multiple of 8 |
Example |
| 9 |
its digits add up to a multiple of 9 |
Example |
| 10 |
it ends in 0 |
Example |
| 12 |
it's a multiple of 3 and 4 |
Example |
Order of Operation
Applying PEMDAS for order of operation. PEMDAS tells what operation is to be done first.
Do things in Parentheses First. Example:
(Powers, Roots) before Multiply, Divide, Add or Subtract. Example:
Multiply or Divide before you Add or Subtract. Example:
Otherwise just go left to right. Example:
Video Lesson - PEMDAS
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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.