# How to Multiply by 5

Instructor: Christine Quist

Christine has taught 4th-5th grade, has worked as a Paraprofessional for Adult Learners, and has a master's degree in Curriculum and Instruction for Elementary Education.

This lesson will teach you how to multiply by 5. It will give you some helpful tips and show you how a clock can be a handy tool when learning your 5x facts.

## Multiplying by 5

Pretend you have just been handed a sack of shiny new nickels, which are each worth 5 cents. To find out how much money you have, we will need to multiply the total number of nickels by 5 cents.

This bag holds 100 nickels. 5 times the 1 in 100 equals 5. Then add the zeros back on the end, and we have 500. 5 x 100 = 500, so we have 500 cents, or \$5.00. You just multiplied by 5!

## Counting by Fives

Multiplying by fives is the same as counting by fives. Counting by fives is easy because you skip any number that does not end in a zero or a five. So in 5 x 4, we'll count 5, 10, 15, 20 to get to our product.

The product is the answer to a multiplication problem. All the products, or answers, to a 5x problem will either end in a zero or a five, like in 10 and 25. Let's look at another handy tool to help you practice.

## On the Clock

Did you ever notice that each number on the clock adds five more minutes? The 1 means it's been five minutes, the 2 means ten minutes, and if you go up to the 12, it means 60 minutes, or one whole hour, has gone by! This makes the clock a good tool when memorizing your 5x facts.

If the long hand is on the four, we know that we have to add 5 four times. 5 + 5 + 5 + 5. To do this, you will count 1, 2, 3, 4 and add five each time: 5, 10, 15, 20. 5 x 4 = 20.

For 5 x 8, you will count around to the 8 by 5s. We found out in the last problem that 5 x 4 = 20, so we can start at the 4 knowing that it stands for 20. Point to the 4 on the clock in the picture and continue counting by 5s to the 8: 20, 25, 30, 35, 40. 5 x 8 = 40. Use your clock to practice your 5x facts!

## Multiplying Larger Numbers by 5

When you multiply 5 by a larger number like 78, you will still use your 5x facts!

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