Mathematics diary of unit 1 in Volume 2 of grade 5

Mathematics diary of unit 1 in Volume 2 of grade 5

Have you ever studied proportion?
Buy clothes
Today, my mother took me to buy clothes. There are often discounts, such as 20% discount, 10% discount and so on
Before I learned proportion, I always thought that a 10% discount was the smallest and a 10% discount was the biggest. But after I learned proportion, I knew that a 10% discount was a 10% discount and a 10% discount was a 90% discount
In this store, I get a 10% discount for one dress and a 20% discount for two. So, I choose a dress with a price of 283 yuan and a dress with a price of 244 yuan and a 20% discount for two. So, I roughly estimated that it would cost about 450 yuan. So, I calculated it in my mind: 283 + 244 = 527 (yuan) 527 times 80% = (yuan). Originally, it's only 421.6 yuan, What's the difference from my estimate? 450-421.6 = 28.4 yuan, 28.4 yuan
That's a good percentage. It saves us a lot of money
So type the text, please understand,