Multiplying Tens
Basics on the topic Multiplying Tens
Multiplying by Multiples of 10
What are multiples of 10? Multiples of 10 are any number that ends in 0. 10, 20, 30 … are all multiples of ten. Multiplying by multiples of ten means that you multiply a number by 10, 20, 30, 40, 50, and so on. Let’s have a look below at a multiplying by ten word problem.
Multiplying by Multiples of 10 – Example
Let’s take a look at this multiplying by multiples of 10 example, two times twenty.
When multiplying multiples of 10 by a single digit, we write a zero in the ones place as a placeholder.
Next, we move to the next place value, the tens place, and we multiply the two by the two above.
Two times two is four, so we write this in the tens place next to the zero. Now we have finished solving! Two times twenty gives a product of forty, which is the solution to the problem.
Multiplying by Multiples of 10 – Summary
To multiply by tens, follow these steps;
Step #  What to do 

1  Set up the problem, using standard algorithm. 
2  Write a zero in the ones place as a placeholder. 
3  Multiply the tens place digit by the single digit and write the product next to the zero. 
How do you explain multiplying by 10? To practise further have a go at our multiplying by multiples of ten worksheets featuring multiplying by multiples of 10 word problems as well as further multiplying by multiples of 10 activities and interactive exercises.
Transcript Multiplying Tens
Mr. Squeaks has built a handheld clone machine which works by multiplying single digit objects by multiples of tens! Mr. Squeaks wants to calculate the final product first so that he doesn't clone too many objects. Mr. Squeaks needs help with "Multiplying Tens". A Multiple of Ten is a number with a zero in the ones place. Ten, Twenty, Thirty and so on are all multiples of ten. To multiply a single digit number by a multiple of ten, first, set up the problem, aligning the place values. Next, write a zero in the ones place. A zero is added here because ANY number multiplied by a multiple of ten will ALWAYS have a zero in the ones place! Finally, multiply the tens place digit by the single digit. Four times five gives a product of twenty which means four times fifty is two hundred! Mr. Squeaks only has two metal rods left and wants to clone them twenty times. Set up the problem writing two times twenty like this. Next, write a zero in the ones place. Now look at the TWO in the tens place and multiply it by two. Two times two is four, so write it in the tens place. The product of two times twenty is FORTY! Mr. Squeaks is happy with forty metal rods, so he uses his machine! "This sure is hungry work..." "but I only have three slices of cheese left!" Let's help multiply his cheese slices by forty so he has plenty to eat. Write three times forty, aligning the place values. What is the next step?
Next, write a zero in the ones place. What should we do next?
Look at the FOUR in the tens place and multiply it by three. What is three times four?
Three times four is twelve. We write twelve in the hundreds and tens place. Three times forty gives us our solution, one hundred and twenty. One hundred and twenty slices of cheese should last Mr. Squeaks a while. Before we join Mr. Squeaks for snack time, let's review! Remember, when multiplying by multiples of ten, first, set up the problem, aligning the place values. Next, write a zero in the ones place. Finally, multiply the tens place digit by the single digit to get the product! "This cheese looks delicious!" Wait, is that the clone machine on Mr. Squeaks' chair?
"Woah, I definitely don't need THAT many Imanis!"
Multiplying Tens exercise

Multiples of ten.
HintsMultiples of ten all have the same digit in the ones place. Can you remember which digit?
These numbers are multiples of ten.
All multiples of ten have a 0 in the ones place.
Solution10, 30, 60 and 70 are all multiples of ten.
They all have a 0 in the ones place.

How do we multiply tens?
HintsThis is our first step.
This is what we would do next.
Finally, we would have this.
Solution First, set up the problem, aligning the place values.
 Write 0 in the answer's ones place.
 Multiply the tens place digit by the single digit.
 Finally, write your answer.

How many of each item will there be?
HintsYou can write out your multiplication problems like this to help you solve them.
Write a 0 in the product's ones place, as we know the product will end in 0.
Multiply the single digit by the digit in the tens place.
SolutionMr. Squeaks would end up with these many items after cloning!
Seeds
 3 x 30 = 90
 2 x 40 = 80
 5 x 60 = 300
 4 x 70 = 280

What will the products of these clones be?
HintsPlace one number on top of the other to help you solve the equation.
Place a 0 in the product's ones place and then multiply the single digit by the digit in the tens place.
Solution120
 2 x 60
 3 x 40
 4 x 30
 3 x 80
 2 x 120
 4 x 60
 6 x 40
 8 x 30
 6 x 50
 5 x 60

Which box should the planks of wood go in?
HintsHow many planks did Mr. Squeaks start with? What is he multiplying that number by?
Mr. Squeaks is trying to work out 7 x 10 =.
If we are solving 7 x 10, what are the steps we need to take?
SolutionMr. Squeaks would put the cloned planks of wood in the box with the label, 70.
He started with 7 planks and multiplied them by 10. If we multiply 7 x 10 we get 70.

Mr. Squeaks' party.
HintsFind the key information in each passage.
 How many items does Mr. Squeaks start with?
 What is he multiplying that number by?
Follow the steps for multiplying a single digit number by a multiple of ten to find the answer.
SolutionMr. Squeaks is so happy, he had a great party!
 Mr. Squeaks wants to stick some balloons up around the room. He has 3 balloons. He decides to use his cloning machine and multiply them by 70. He now has 210 balloons.
 Mr. Squeaks finds 6 party hats. He decides to clone them and inputs 30 into his cloning machine. He now has 180 hats. That should be plenty!
 It wouldn't be a party for Mr. Squeaks without cheese! He finds 3 pieces of cheese in his fridge but decides to use the machine to multiply them by 90. There are now 270 pieces of cheese, yum!
 Mr. Squeaks decides he also wants to decorate with some bunting. He finds 4 packs of bunting and multiplies them by 40. He now has 160 packs of bunting. Better get hanging it up!
 Mr. Squeaks made so many decorations (and pieces of cheese!) but only 2 guests turned up! "Never mind," he thought as he pulled out his cloning machine and inputted 100 into it. Now there are 200 guests! Let's party!
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