Exploring Adding and Subtracting Rational Expressions

The video tutorial covers the concept of divisibility, explaining how a number is divisible by another if there is no remainder. It lists numbers divisible by 2, 3, 4, 5, 6, 9, and 10, and explains the rules for determining divisibility. The tutorial provides examples to illustrate how to apply these rules to different numbers, helping learners understand and identify patterns in divisibility.

Which of the following numbers is divisible by 2?

• 1854

• 1853

• 1855

• 1856

What is the rule for a number to be divisible by 3?

• The number formed by the last two digits must be divisible by 4.

• The number must end in 0 or 5.

• The sum of its digits must be divisible by 3.

• The number must be even.

Which of the following numbers is divisible by 4?

• 39

• 36

• 37

• 38

A number is divisible by 5 if it ends in which digits?

• 0 or 7

• 0 or 5

• 0 or 3

• 0 or 2

If a number is divisible by both 2 and 3, it is also divisible by which number?

• 5

• 4

• 6

• 9

Is the number 798 divisible by 4?

• Yes

• Only if it ends in 5

• No

• Only if it ends in 0

What is the sum of the digits of 925?

• 17

• 16

• 15

• 14

Is the number 540 divisible by 9?

• No

• Yes

• Only if it ends in 0

• Only if it ends in 5

Which of the following numbers is not divisible by 10?

• 70

• 100

• 85

• 90

If a number is not divisible by any of the listed numbers, what should you write?

• Not divisible

• Zero

• None

• Invalid