Subtraction with Whole Numbers - Basic Math
Card 1 of 28
Paul had 
video games. On Monday, he gave 
video games to his friend Chris. On Tuesday, he sold 
of his video games to the local video game shop. On Wednesday, Paul accidentally broke 
video games and threw them away. How many video games does Paul have left?
Paul had
Tap to reveal answer
This is a simple subtraction problem.
First, subtract the number of video games Paul gave to Chris on Monday.
Now, subtract the number of video games Paul sold from the number he has left.
Finally, subtract the number of video games Paul broke and threw away.
This is a simple subtraction problem.
First, subtract the number of video games Paul gave to Chris on Monday.
Now, subtract the number of video games Paul sold from the number he has left.
Finally, subtract the number of video games Paul broke and threw away.
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What is the solution of the above equation?
What is the solution of the above equation?
Tap to reveal answer
We can show this using objects:
We can see that only 7 objects are left.
We can show this using objects:
We can see that only 7 objects are left.
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What is the solution of the above equation?
What is the solution of the above equation?
Tap to reveal answer
We can see that by the objects.
We can see that there is only one object left.
We can see that by the objects.
We can see that there is only one object left.
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Timmy has 
sea monkeys. At the end of the first month that he has them, 
sea monkeys die, and his parents buy him 
new ones. At the end of the second month, 
more sea monkeys die. How many sea monkeys does Timmy have at the end of the second month?
Timmy has
Tap to reveal answer
The problem can be solved as follows. First, calculate the number of sea monkeys left at the end of the first month:
Then, calculate the number of sea monkeys left at the end of the second month:
The problem can be solved as follows. First, calculate the number of sea monkeys left at the end of the first month:
Then, calculate the number of sea monkeys left at the end of the second month:
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Solve for 
:
Solve for
Tap to reveal answer
To solve for n we need to isolate n on one side of the equation and all of the constants on the other side.
We do this by adding 15 to both sides.
Then we add 12 to both sides to get our final answer.
To solve for n we need to isolate n on one side of the equation and all of the constants on the other side.
We do this by adding 15 to both sides.
Then we add 12 to both sides to get our final answer.
← Didn't Know|Knew It →
What is 
?
What is
Tap to reveal answer
If you need to break it down, you can split it into smaller pieces:
and 
, and then add the pieces back together: 
.
If you need to break it down, you can split it into smaller pieces:
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A city bus has five stops left on its route. At the first stop, 
people get off. At the second stop, 
get off. At the third, no one gets off. At the fourth, 
people get off. At the fifth, there are 
people left on the bus, and they all get off. How many people were on the bus before the first stop?
A city bus has five stops left on its route. At the first stop,
Tap to reveal answer
To solve, create a linear equation:
represents the total number of people on the bus before the first stop.
We then subtract the amount of people that got off at each stop and set that equal to the number of people to get off at the final stop.
To solve, create a linear equation:
We then subtract the amount of people that got off at each stop and set that equal to the number of people to get off at the final stop.
← Didn't Know|Knew It →
Paul had video games. On Monday, he gave video games to his friend Chris. On Tuesday, he sold of his video games to the local video game shop. On Wednesday, Paul accidentally broke video games and threw them away. How many video games does Paul have left?
Paul had
Tap to reveal answer
This is a simple subtraction problem.
First, subtract the number of video games Paul gave to Chris on Monday.
Now, subtract the number of video games Paul sold from the number he has left.
Finally, subtract the number of video games Paul broke and threw away.
This is a simple subtraction problem.
First, subtract the number of video games Paul gave to Chris on Monday.
Now, subtract the number of video games Paul sold from the number he has left.
Finally, subtract the number of video games Paul broke and threw away.
← Didn't Know|Knew It →
What is the solution of the above equation?
What is the solution of the above equation?
Tap to reveal answer
We can show this using objects:
We can see that only 7 objects are left.
We can show this using objects:
We can see that only 7 objects are left.
← Didn't Know|Knew It →
What is the solution of the above equation?
What is the solution of the above equation?
Tap to reveal answer
We can see that by the objects.
We can see that there is only one object left.
We can see that by the objects.
We can see that there is only one object left.
← Didn't Know|Knew It →
Timmy has sea monkeys. At the end of the first month that he has them, sea monkeys die, and his parents buy him new ones. At the end of the second month, more sea monkeys die. How many sea monkeys does Timmy have at the end of the second month?
Timmy has
Tap to reveal answer
The problem can be solved as follows. First, calculate the number of sea monkeys left at the end of the first month:
Then, calculate the number of sea monkeys left at the end of the second month:
The problem can be solved as follows. First, calculate the number of sea monkeys left at the end of the first month:
Then, calculate the number of sea monkeys left at the end of the second month:
← Didn't Know|Knew It →
Solve for :
Solve for
Tap to reveal answer
To solve for n we need to isolate n on one side of the equation and all of the constants on the other side.
We do this by adding 15 to both sides.
Then we add 12 to both sides to get our final answer.
To solve for n we need to isolate n on one side of the equation and all of the constants on the other side.
We do this by adding 15 to both sides.
Then we add 12 to both sides to get our final answer.
← Didn't Know|Knew It →
What is ?
What is
Tap to reveal answer
If you need to break it down, you can split it into smaller pieces:
and , and then add the pieces back together: .
If you need to break it down, you can split it into smaller pieces:
← Didn't Know|Knew It →
A city bus has five stops left on its route. At the first stop, people get off. At the second stop, get off. At the third, no one gets off. At the fourth, people get off. At the fifth, there are people left on the bus, and they all get off. How many people were on the bus before the first stop?
A city bus has five stops left on its route. At the first stop,
Tap to reveal answer
To solve, create a linear equation:
represents the total number of people on the bus before the first stop.
We then subtract the amount of people that got off at each stop and set that equal to the number of people to get off at the final stop.
To solve, create a linear equation:
We then subtract the amount of people that got off at each stop and set that equal to the number of people to get off at the final stop.
← Didn't Know|Knew It →
Paul had video games. On Monday, he gave video games to his friend Chris. On Tuesday, he sold of his video games to the local video game shop. On Wednesday, Paul accidentally broke video games and threw them away. How many video games does Paul have left?
Paul had
Tap to reveal answer
This is a simple subtraction problem.
First, subtract the number of video games Paul gave to Chris on Monday.
Now, subtract the number of video games Paul sold from the number he has left.
Finally, subtract the number of video games Paul broke and threw away.
This is a simple subtraction problem.
First, subtract the number of video games Paul gave to Chris on Monday.
Now, subtract the number of video games Paul sold from the number he has left.
Finally, subtract the number of video games Paul broke and threw away.
← Didn't Know|Knew It →
What is the solution of the above equation?
What is the solution of the above equation?
Tap to reveal answer
We can show this using objects:
We can see that only 7 objects are left.
We can show this using objects:
We can see that only 7 objects are left.
← Didn't Know|Knew It →
What is the solution of the above equation?
What is the solution of the above equation?
Tap to reveal answer
We can see that by the objects.
We can see that there is only one object left.
We can see that by the objects.
We can see that there is only one object left.
← Didn't Know|Knew It →
Timmy has sea monkeys. At the end of the first month that he has them, sea monkeys die, and his parents buy him new ones. At the end of the second month, more sea monkeys die. How many sea monkeys does Timmy have at the end of the second month?
Timmy has
Tap to reveal answer
The problem can be solved as follows. First, calculate the number of sea monkeys left at the end of the first month:
Then, calculate the number of sea monkeys left at the end of the second month:
The problem can be solved as follows. First, calculate the number of sea monkeys left at the end of the first month:
Then, calculate the number of sea monkeys left at the end of the second month:
← Didn't Know|Knew It →
Solve for :
Solve for
Tap to reveal answer
To solve for n we need to isolate n on one side of the equation and all of the constants on the other side.
We do this by adding 15 to both sides.
Then we add 12 to both sides to get our final answer.
To solve for n we need to isolate n on one side of the equation and all of the constants on the other side.
We do this by adding 15 to both sides.
Then we add 12 to both sides to get our final answer.
← Didn't Know|Knew It →
What is ?
What is
Tap to reveal answer
If you need to break it down, you can split it into smaller pieces:
and , and then add the pieces back together: .
If you need to break it down, you can split it into smaller pieces:
← Didn't Know|Knew It →