# MATH

• ### WELCOME TO MATH!

Today we will study how to make and count change correctly.

RIDDLE: I have three coins that equal 16¢. What three coins do I have?

What is another group of coins that equals 16¢?

Here is a video from Kahn Academy regarding counting coins. COUNTING COINS

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Let's imagine I bought a pencil for 49¢ and paid for it with a one-dollar bill.
Did I pay more, less than, or the same as the actual cost of the pencil?
How do you know?

Since I paid more than the actual cost, I should receive some change, which is the difference between \$1, or 100¢ and 49¢.

Since I paid \$1, or 100¢ for the pencil, I can count from 49¢ up to \$1 to find the difference or change.
NOTE: In this situation I begin with the coins of the least value (which is the reverse of what I do when I am determining the value of a set of coins and bills.)

So I begin with a penny, and I count 50¢;

I add a quarter and count 75¢;

I add a second quarter and count \$1 or 100¢

T
he penny and two quarters are the change I would receive.

Now, please read the problem at the top of page 50 and the paragraph below it.

NOTE:
When making change you usually try to use the least number of bills and coins. Sometimes, however, you may not have coins or bills of a certain value, so you must find alternate combinations.

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