Adding by 5

Overview

In the previous lessons, we’ve learned how to add by 1, add by 2, and add by 3.

You guessed it! In this lesson, we will take a deep dive into adding by 5 and how to quickly add.

Sometimes we have a group of objects and then we want to add exactly 5 more objects to that group. It might look like this:

Let’s take a look at the example above.

There are 4 keys in the first group. There are 5 more keys in the second group.
We can ADD them. We do this by joining the 2 different amounts together.

This will give us the total number of keys.

When we ADD 4 plus 5, we have 9 in all.
We say: FOUR plus FIVE equals NINE.
We write it like this: 4 + 5 = 9

Here is another example to try.

In this problem, we are joining together two groups of raindrops.
We are ADDING them together.

This will give us the total number of raindrops.

When we ADD 5 plus 3, we have 8 in all.
We say: FIVE plus THREE equals EIGHT.
We write it like this: 5 + 3 = 8

 Let’s take a look at another example with numbers.

This time, we are joining the numbers 2 and 5.
These numbers are known as ADDENDS.

Remember that the term “addends” refers to the numbers that will be added together.

This problem reads as 2 + 5 = 7.
When the ADDEND 2 is joined with the ADDEND 5, we get a SUM of 7.
Remember that the SUM is used to describe the total amount.

When we add FIVE MORE to a group of objects, we can remember that the SUM will be the number that comes five after that number when we are counting.

6 + 5 =

For example, 6 + 5 = 11. We also know that when we count up, the number that comes five after 6 is the number 11. We can say: SIX… SEVEN, EIGHT, NINE, TEN, ELEVEN. We have counted up FIVE to get to the number ELEVEN. This can help us to add quickly and correctly when adding 5 to a group.

2 + 5 =

Let’s try another example. What is 2 + 5? We can add or count five more from the number 2. We can count up by five. TWO… THREE, FOUR, FIVE, SIX, SEVEN. Therefore, 2 + 5 = 7.

5 + 10 =

Here is another example. This time our 5 comes first and a larger group comes second. We can still solve in the same way. What is 5 + 10? We can add or count on five more from the number 10. This time, draw a picture to solve. Make a group of five objects and another group of 10 objects. Then count them altogether to find the total. When we solve, we will find out that 5 + 10 = 15.

Look at the example above. Two groups are being joined together to find the total.
We can count the pictures to help us add.

4 circles plus 5 circles will tell us how many circles there are in all.
4 circles + 5 circles = 9 circles in all.
There are 9 circles in all.

There are special keywords that help us identify when to add. For example, we can JOIN two amounts together to find the TOTAL. Take a look at the picture below to review some other keywords that is related to addition.

Knowing these keywords will help you understand that in order to solve the problem, you must add. Later on, you will work on word problems and you need to understand whether or not the word problem is asking you to add. These keywords above will help you identify the correct mathematical operation.

Take a look at this example below:

There were 4 birds on a tree. Suddenly, 2 birds flew away. How many birds are left on the tree?

You should be able to identify that this is NOT an addition problem, but a subtraction problem. The keyword “away” should alert us that this is a subtraction problem. This is why the picture above with the keywords is very helpful when we move on to talk about other mathematical operations such as subtraction.

We can also add 5 in story problems.

In the problem, Sara and Jack are eating slices of pizza. To solve, we need to add. The keyword that helps us to decide this is ALTOGETHER.

THREE slices combined with FIVE slices will give us the correct SUM.
We can draw and count to help us find the answer.

3 + 5 = 8 slices altogether

There are many additional strategies you can use to help you add correctly. We will continue to learn about these in other lessons.

Practice Question 1

Write the addition sentence and solve the problem below.

REVEAL THE ANSWER

Practice Question 2

 Write the addition sentence and solve the problem below.

REVEAL THE ANSWER

Practice Question 3

Take a look at the math sentence below. Draw a picture to match it. Then solve.

10 + 5 =

REVEAL THE ANSWER

Practice Question 4

Look at the groups below.
How many baseballs are there in all?
Write an addition sentence and solve.

REVEAL THE ANSWER

Practice Question 5

Look at the animals below.
How many animals are there in all?
Write an addition sentence and solve.

REVEAL THE ANSWER

Now you’re ready to take a quick quiz on addition! Click below!