# Money and Debts

Warmup

Activity #1

At the beginning of the month Kiran had \$24 in his school cafeteria account.

Representing a Transaction on a Number Line.

In the first week he spent \$16 on lunch.

(1.) How much was in his account then?

(2.) Use a variable to represent the unknown quantity and write an equation to represent it.

(3.) What is the unknown quantity?

• Represent the transaction on the number line below.

Then Kiran deposited some more money and his account balance was \$28.

(4.) How much did he deposit?

(5.) Use a variable to represent the unknown quantity and write an equation to represent it.

(6.) What is the unknown quantity?

• Represent the transaction on the number line below.

Then he spent \$34 on lunch the next week.

(7.) How much was in his account then?

(8.) Use a variable to represent the unknown quantity and write an equation to represent it.

(9.) What is the unknown quantity?

• Represent the transaction on the number line below.

Then he deposited enough money to pay off his debt to the cafeteria.

(10.) How much did he deposit?

(11.) Use a variable to represent the unknown quantity and write an equation to represent it.

• Represent the transaction on the number line below.

(12.) Explain why it makes sense to use a negative number to represent Kiran’s account balance when he owes money.

Activity #2

Solving Money Problems using Linear Equations.

• Solve as many problems as you can using the applet below.

Activity #3

Money Game.

• Interact with the applet below to test your skills in buying items from a store.

Challenge #1

(1.) If we put withdrawals and deposits in the same column, how can they be represented?

(2.) Andre withdraws \$40 to buy a music player. What is his new balance?

(3.) If Andre deposits \$100 in this account, will he still be in debt? How do you know?

Challenge #2

The table shows five transactions and the resulting account balance in a bank account, except some numbers are missing. Fill in the missing numbers.

Challenge #3

Quiz Time