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Lesson 1: Factors and multiples

# Reasoning about factors and multiples

Use the equation 3x5=15 to understand the relationship between factors and multiples. Created by Sal Khan.

## Want to join the conversation?

• um... whats a factor of 78 plz help im cofuzed🤔
• The factors of 78 are 1,2,3,6,13,26,39,78.
To figure these out be sure to check the previous lesson on divisibility checks.
• how do i do fector pair?
• You don't exactly do factor pairs. The factor pairs of a number are various pairs of numbers that when multiplied will get you to that number. So, say with prime numbers, there's only one factor pair: 1 and itself. For composite numbers, the factors are more than two. So, answering your question, the factor pairs of a number will always be easy to figure out once you know what type of number it is. To organize a factor pair, just type\write say for 67, 1 and 67 or 1x67.
• what are factors of 82?
• 82 is a composite number and has 4 factors which are 1, 2, 41 and 82!

Happy Learning!
• wait if a multiple of 20 is 5 and 4 than a factor of 20 would be 5 and 4 how the heck am i supposed to know what is wich
• Multiples of 20 are 20, 40, 60, etc.
Factors of 20 are 1, 2, 4, 5, 10, 20
• 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, and 150
• 15/5=3 and 15/3=5 because 5x3=15
or the other way around 3x5 also =15
• thank you
• what is factor i mean why factor is multiply numbers
(1 vote)
• im lazy so ima just copy and paste some random thing from google: factor, in mathematics, a number or algebraic expression that divides another number or expression evenly—i.e., with no remainder. For example, 3 and 6 are factors of 12 because 12 ÷ 3 = 4 exactly and 12 ÷ 6 = 2 exactly. The other factors of 12 are 1, 2, 4, and 12.
• 0/7 questions right i am a noob at this i never get a 100% (this is hard and don´t read this)
(1 vote)
• Most math is like that at the start. Just keep practicing and you will master it completely! :)