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Contributor: Ashley Nail Murphy. Lesson ID: 14123
Adding and subtracting by 1, 2, or even 3 is easy! Can you add and subtract by 5? Get ready to practice addition and subtraction with 5. You may even notice some fun patterns!
This is Ben and his dog Cooper. Hi, Ben! Hi, Cooper!
Ben bought 12 dog treats at the pet shop. He already had 5 dog treats at home.
He took Cooper on a walk. Then, he gave Cooper 5 treats!
Later, Ben’s mom came home from work. She gave Cooper 5 more treats!
Ben wonders how many dog treats he has left for Cooper.
Ben needs to find out how many treats he has left for Cooper.
You can help Ben by using addition and subtraction!
Look at Ben’s story more closely.
Ben bought 12 dog treats at the pet shop. He already had 5 dog treats at home.
First, write an addition expression.
12 + 5 =
Use a number line to add.
Start at 12. Move 5 steps forward to add 5.
You landed on 17. 17 is the sum of 12 and 5!
12 + 5 = 17
Ben has 17 total dog treats!
Now, look at the next part of Ben’s story.
He took Cooper on a walk. Then, he gave Cooper 5 treats!
Ben started with 17 dog treats and took 5 away.
Write a subtraction expression.
17 - 5 =
Use a number line to subtract.
Start at 17. Move 5 steps backward to subtract 5.
You landed on 12. 12 is the difference of 17 and 5!
17 - 5 = 12
Ben has 12 dog treats left after the walk!
Finally, look at the end of Ben’s story.
Later, Ben’s mom came home from work. She gave Cooper 5 more treats!
Ben has 12 dog treats after Cooper’s walk. His mom takes 5 away.
Write a subtraction expression.
12 - 5 =
Use a number line to subtract.
Start at 12. Move 5 steps backward to subtract 5.
You landed on 7. 7 is the difference of 12 and 5!
12 - 5 = 7
Ben has 7 dog treats left for Cooper!
You added and subtracted by 5 to help Ben solve his problem!
Look at the three equations you used.
12 + 5 = 17
17 - 5 = 12
12 - 5 = 7
Try some more adding and subtracting by 5.
There are 8 dog treats. Takeaway 5 dog treats.
Count the dog treats left. There are 3 dog treats left.
8 - 5 = 3
Next, there are 8 dog treats. Add 5 more dog treats.
Count the total number of dog treats. There are 13 dog treats.
8 + 5 = 13
Compare both equations.
8 - 5 = 3
8 + 5 = 13
Both equations start with the same number. Also, both answers have the same number in the ones place!
This was true in Ben’s story, too!
12 + 5 = 17
12 - 5 = 7
Now, it's your turn to practice adding and subtracting by 5!
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