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3rd-5th Grade Math: Practice & Review37 chapters | 252 lessons

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Lesson Transcript

Instructor:
*Yuanxin (Amy) Yang Alcocer*

Amy has a master's degree in secondary education and has taught math at a public charter high school.

In this video lesson, you will learn how to find your multiples of 5. You will know how to easily say and write the numbers you get when you multiply a number by 5.

All of your numbers that you get when you multiply by 5 are called **multiples of 5**. Knowing these multiples of 5 will help you when you need to answer a multiplication-by-5 problem. These types of problems are actually pretty common on math tests, and you might even come across these in your daily life. For example, if you have a group of 5 people, and you want to figure out how much you all have in total if you each have $20, you will need to multiply the $20 by 5 to find your answer. If you are familiar with your multiples of 5, you will be able to quickly figure out your answer. Let's get going to see how to find the multiples of 5.

To find your multiples of 5, you can begin by thinking about what multiplication is. If you think of multiplication as repeated addition, then you can think about multiplication by 5 as addition problems where you keep adding a 5 to your previous number.

So, if you started with 0, your next number then is 0 + 5 = 5. How many 5s have you added? 1. So this is 5 * 1. Your next number is 5 + 5 = 10. This is 5 * 2. Next comes 5 * 3, which is 10 + 5 = 15. 5 * 4 then is 15 + 5 = 20. Do you notice a pattern beginning? Yes, the last digit alternates between 0 and 5.

- 5 * 1 = 5
- 5 * 2 = 10
- 5 * 3 = 15
- 5 * 4 = 20
- 5 * 5 = 25

So, just start counting and increase your number each time by 5. You can identify multiples of 5 by just looking at the last digit. If it is a 0 or a 5, then you are looking at a multiple of 5.

Saying the multiples of 5 is as easy as saying any regular numbers. So, 5 is 'five.' 10 is 'ten.' 15 is 'fifteen.' 20 is 'twenty.' And so on. What comes after 'twenty?' 'Twenty-five.'

Just like saying multiples of 5, writing multiples of 5 is exactly like writing any regular number. Just take the words that you say and write them as you've said them. So, your list becomes five, ten, fifteen, twenty, twenty-five, thirty, thirty-five, etc. For multiples of 5 twenty-five and above, include a dash for any two-word number combinations: thirty-five, forty-five, ninety-five. If you have a larger multiple of 5, such as 125, you would write it as one hundred twenty-five. So, only the last two numbers are connected with the hyphen.

Let's review what you've learned. Your **multiples of 5** are your numbers that you get when you multiply by 5. To find them, start counting by increasing each number by 5. So, 5, 10, 15, 20, etc.

You can identify multiples of 5 by just looking at the end digit. If it is a 0 or 5, then you are looking at a multiple of 5.

Saying and writing multiples of 5 is just as easy as reading any number. When writing them, include a dash for any 2-word number combinations, such as twenty-five.

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3rd-5th Grade Math: Practice & Review37 chapters | 252 lessons

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