Grandma bought 3 Jin 4 Liang eggs, 3 yuan and 50 cents per Jin. Grandma handed it in 12 yuan. How much should I get back? As soon as grandma's voice fell, grandpa said, "Change 1 minute!" "I don't believe that Grandpa can calculate so fast, so I use the mathematical knowledge I have learned to calculate: unit price multiplied by quantity = total price; Spent money = recovered money, exactly the same as grandpa's, and the change is 1 minute. I asked grandpa why he calculated so fast. It turned out that Grandpa divided 3 yuan's five horns into five parts.
3 yuan +5 angle, first calculate 3.4 times 3= 10.2 yuan, then calculate 3.4 times 0.5, which is 3.4.
Half of it is 17 yuan, so a * * spent 1 1.9 yuan and paid 12 yuan, of course, a dime.
Yes After grandpa finished, I realized that he used multiplication and division.
Through this incident, I understand that mathematics can be used anywhere around us. Let mathematics serve us!
September