Sunday

light rain

Today, my mother bought a box of 6 kilograms of milk and 500 grams of meat. I want to count how many grams my mother bought. Suddenly, I remembered.

When the teacher talks about the same topic in class, he should convert different units into the same one, and then add up the two numbers. So, I converted 6 kilograms into 6,000 grams, and then 6,000 grams +500 grams = 6,500 grams. This is really an easy math problem to do.

Math diary III

Month, day and week

In the evening, I saw a problem in the Olympiad Book: the number of apple trees in the orchard is three times that of pear trees. Master Lao Wang fertilizes 50 apple trees and 20 pear trees every day. A few days later, all the pear trees were fertilized, but the remaining 80 apple trees were not fertilized. Excuse me: How many apple trees and pear trees are there in the orchard?

I am not intimidated by this question, but it can stimulate my interest. I think the apple tree is three times as big as the pear tree. If two kinds of trees are to be fertilized on the same day, Master Lao Wang will fertilize "20×3" apple trees and 20 pear trees every day. In fact, he only fertilizes 50 apple trees every day, which is 10, and the last 80 trees. Therefore, Master Lao Wang has been fertilizing for 8 days. 20 pear trees a day, 8 days is 160 pear trees. According to the first condition, there are 480 apple trees. This is to solve the problem with the idea of hypothesis, so I think the hypothesis method is really a good way to solve the problem.