We came to the children's wear store, and my mother bought me a down jacket, 398 yuan. Mom bought me another pair of pants, 99 yuan. Then, he bought me a pair of 199 boots. Then, we returned with a full load.
On the way home, my mother asked me; "Do you know how much it cost to buy you something today?" I thought about it and said, "It cost 696 yuan." Mom smiled and asked, "How did you get it out so soon?" I confidently said, "Use the estimation method taught by the teacher!" 398 yuan is close to 400 yuan, 99 yuan is close to 100 yuan, 199 yuan is close to 200 yuan. First, add up these three numbers, 400+65,438+000+200 = 700, because four are added and all are subtracted, which is 700-4=696 (yuan). "
After listening to my words, my mother nodded happily and gave me a thumbs-up sign! I thought to myself, "As long as you are good at thinking, you can apply what you have learned to your life."
Article 1
This holiday, I read the classic math series of horror science. It tells the mystery of mathematics in an interesting form. Although it