Idea 16of 23Builds onPercent off is a fraction offBigger is not always cheaper
A sale, or a bigger pack?
Is the pack on sale always the better value?
Today you'll discover
- how to find a sale price
- how to compare it per item
- when the sale wins
Think first4 cans 25% off $8.00, or 6 cans for $8.40
4 cans are 25% off $8.00. 6 cans are $8.40. Which costs less per can?
Decide first, then press Next. Take the percent off first, then divide by the cans.
Two packs of cans: 4 cans with an orange line, 25% off this week, and a tag of $8.00; 6 cans with a tag of $8.40. Then the line 25% off: $8.00 − $2.00 = $6.00 and the tag changes to $6.00, with bars cut into 4 and 6 parts. Then $6.00 ÷ 4 = $1.50 and $8.40 ÷ 6 = $1.40, and the $1.40 bar is ticked. The last step asks about yogurt cups.
See the whole ideathe big idea and the key word, in one place
The big idea
Find the sale price first, then compare unit prices: a sale is not always best.
Two steps
First the sale: 25% off $8.00 is $6.00. Then the unit price: $6.00 ÷ 4 = $1.50 a can.
- Was$8.00
- Sale price$6.00
- Per can$1.50
Easy to get wrongA bright sale sign is not a unit price. Work out the price per can before you decide.
Key word
- sale price
- the price you pay after the amount off is taken away
Ready to use it?
- Find a sale price, then its unit price.
- Compare a sale pack with a bigger pack.