DISCOUNTS AND DIVIDING BY RATIONAL NUMBERS LESSON PLAN
What is a discount?
A discount is an amount of money that is subtracted from the total cost of an item. Discounts are considered our savings. Discounts can be written in fraction form or as a percentage. We will often see something like ½ off of the retail price. This is an example of a discount.
How do we divide rational numbers?
We divide rational numbers by following the rules for dividing fractions.
Here we changed the problem to a multiplication problem by inverting the second fraction. Then we multiplied across and simplified the final fraction.
We can also divide a rational number and a whole number.
Here we made the whole number a fraction over one. Then we changed the problem to a multiplication problem and inverted the second fraction. Finally, we were able to multiply across and our final answer is 72.
How do we use dividing rational numbers with discounts?
When we see a discount for one-half off of a price, we are essentially dividing that price into one-half and then subtracting the one-half from the rest of the purchase price.
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