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Priya wants to buy 3 tickets for a concert. Each ticket costs \$50. She has earned \$135.
For each transaction:
Here is a bank statement.
Banks use positive numbers to represent money that gets put into an account and negative numbers to represent money that gets taken out of an account. When money is put into an account, it is called a deposit. When money is taken out of an account, it is called a withdrawal.
People also use negative numbers to represent debt. If we take out more money from our account than we put in, then we owe the bank money, and our account balance will be a negative number to represent that debt. For example, if we had \$200 in our bank account, and then we wrote a check for \$300, we would owe the bank \$100, and our account balance would be -\$100.
| starting balance | deposits and withdrawals | new balance |
|---|---|---|
| 0 | 50 | |
| 50 | 150 | |
| 200 | -300 | |
| -100 |
In general, we can find a new account balance by adding the value of the deposit or withdrawal to it. We can also tell how much money is needed to repay a debt using the fact that to get from a value to 0, we need to add its opposite.
A deposit is when money is put into an account.
For example, a person added \$60 to their bank account. Before the deposit, they had \$435. After the deposit, they had \$495, because .
A withdrawal is when money is taken out of an account.
For example, a person took out \$25 from their bank account. Before the withdrawal, they had \$350. After the withdrawal, they had \$325, because .