Ordering Numbers Up to 20
Basics on the topic Ordering Numbers Up to 20
Ordering Numbers Up to 20
When we count, we mention numbers in a specific order. Let’s learn more about comparing and ordering numbers with the following explanation. When we talk about the ordering numbers to 20, we mean listing things in a certain way. The numbers one to twenty follow a certain list when counting. It goes like this:
If you see the numbers in different places, it's called out of order. It could look like this:
Ordering Numbers with Number Lines
To help us, we can try ordering 2 digit numbers using a number line as a guide. Let’s start by ordering numbers to 10. Here are five numbers that are out of order:
Here are the numbers that are still in place.
Start by comparing the numbers still in place to a number line below it.
Then, find the first blank spot and look at the number line. The number line says two, so we need to find the number two and put it here.
Now, move to the next blank spot and check the number line below. The number line below says three, that means the number three will go here.
Let's look at the next blank spots and check them with the number line below. The number line shows us that five belongs here, eight belongs here and ten belongs here. So we put the numbers back in their places!
Now that the numbers are all back in order, let's count them to check our work by counting! One, two, three, four, five, six, seven, eight, nine, ten! Ordering numbers is easy! You can try it yourself with the ordering numbers year 1 worksheets below.
You can repeat the same process for ordering numbers with the numbers eleven to twenty.
Ordering Numbers Up to 20 – Summary
If you want to order numbers up to twenty, you should follow these steps:
Step #  What to do 

1  Put a number line below the list with missing numbers. 
2  Look at the missing spaces and compare them to the number line below. 
3  Then, write the correct numbers in their spots. 
4  Finally, count the order to check your work! 
Have you practised with an ordering numbers worksheet yet? On this website, you can find ordering 2 digit numbers interactive exercises, worksheets and more activities for revision in year 1.
Transcript Ordering Numbers Up to 20
Henry and Skylar are visiting a friend that lives in a tall block of flats. But, there is a problem! A buffalo moved in and every time he stomps down the hall, the flat numbers fall off the doors! Now the numbers are all out of order and they can't find their friend! Let's learn about ordering numbers up to twenty to help! When we talk about order, we mean listing things in a certain way. When we count from one to twenty in ones, we have to say the numbers in a certain order. This is the order that the numbers go in. If you see the numbers in different places, it's called out of order. To help us order numbers up to twenty, we can use a number line as a guide. Let's show Skylar how to use a number line to order the door numbers from one to ten. Five flat numbers are on the floor. But some of the flats still have their numbers on their doors. Let's start by comparing the line of doors to a number line. Begin by matching them up. Then, find the first blank door and look at the number line below. The number line says two, so we need to find the number two and put it here. Now, move to the next blank door and check the number line below. The number line below says three, that means the number three will go here. Let's look at the next blank doors and check them with the number line below. The number line shows us that five belongs here, eight belongs here and ten belongs here. Let's put the numbers back in their places! Now that the numbers are all back in order, let's count them to check our work! One, two, three, four, five, six, seven, eight, nine, ten! Well done, Skylar! Now let's help Henry. These are the flats numbered eleven to twenty. Four of the flats have their numbers on the floor and six still have numbers on the doors. Let's check with a number line to find where each number belongs. Start by matching them up. Then find the blank doors and look for those places on the number line below. What numbers will we need? We will need eleven, thirteen, sixteen and nineteen! Now we can put the numbers back where they belong and count to make sure they are in the right order. Eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty! While Henry and Skylar find where their friend lives, let's review! Today we learned about ordering numbers to twenty by using a number line. First, put a number line below the list with missing numbers. Next, look at the missing spaces and compare them to the number line below. Then, write the correct numbers in their spots. Finally, count the order to check your work! "I'm glad we got everything sorted but this can't keep happening!" "You're right, Henry, I have an idea." "No more stomping down the hall now!"
Ordering Numbers Up to 20 exercise

Which of these rows of numbers are in the correct order?
HintsUse this number line to 10 to help you decide if the numbers are in the correct order.
Two of the rows of doors have their numbers in the correct order, so there are two correct answers.
SolutionWe can use a number line to help us check whether the doors are in the right order.
The doors that were correct were the doors that went: 3 4 5 6 7 8 and 5 6 7 8 9 10, as this is the order of the numbers on the number line.
The other two rows of doors were incorrect as they were not in the same order as the numbers on the number line.

Put the numbers back on the doors.
HintsThe number 1 is already on the door. What number would come after 1?
Use this number line to help you put the numbers in the correct order.
Here are some of the missing numbers.
SolutionHere are the door numbers in the correct order.

Counting to twenty.
HintsUse this number line to 10 to help you order the numbers.
Look at the number line to 20 to help you.
When you type in the number, make sure that you type in using the digits, not words.
Solution"1, 2, 3, 4 you're the friend I'm looking for. 5, 6, 7, 8. I'm really glad that you're my mate!" "9 and 10 shall we sing it again?"
"11, 12, 13, 14, 15, 16 I wear a feather and it's green!" "17, 18, 19, 20 I think we'll stop as that is plenty!"

Missing numbers.
HintsStart counting up from 11. What numbers come next?
Use this number line from 1120 to help you.
SolutionThe numbers that were missing were: 12, 15, 17 and 19.
These can be seen on the one number line above.

Which numbers have fallen off the doors?
HintsLook at this number line that goes from 1020. Can you spot where the missing numbers are from the doors?
The first missing door number comes after 13. What comes after 13 when you are counting up to 20?
The second door number that is missing comes after 17. What comes after 17 when you are counting up to 20?
SolutionThe missing door numbers were 14 and 18.

Sorting numbers.
HintsThe lowest or smallest number here is 4, so that should go first.
Use this number line to help you order the numbers.
SolutionThe correct order of the numbers is:
4, 8, 12, 15, 17, 19, 20.
When placed from 020, these numbers would be in these positions:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.