Article 1:

Today, when I was eating, I found that my desk was square, and that desk had four corners. Dad said, "I'll give you a question to test you." If you cut off one corner of a square, how many corners are there? " I want to cut off a corner. The original corner has become two corners. Add the original' three corners' and there are five corners.

Dad said, "Is there any other way to cut it?" This stumped me. Is there any other way to cut it? I thought about it for a long time, but I didn't come up with it. Dad saw that I was stumped, so he said, Bring a square piece of paper and let's cut a corner to see. I brought a square piece of paper and scissors, and my father instructed me to cut them. Because of the different positions of scissors, there are three situations.

Although a corner is cut off, the cutting methods are different and the results are different. It seems that learning mathematics needs deep thinking.

Article 2:

One day, while playing games, I met a challenging problem. As long as I get the question right, I will get the corresponding reward. The question is this: from 1+2+3+... 100 =? I don't know when to add this.

I quickly asked my father, who taught me a good way: for example, if you add 1 to 6, you can form 1+6 = 7, 2+5 = 7, 3+4 = 7, plus three 7s or 3x7, the number is 2 1. The calculation method is to add the first number 1 and the last number 6 to get 7, and then multiply it by half of the last number, that is, multiply it by 6 ÷ 2 = 3, 3× 7 = 2 1, which is much more convenient.

I tried to calculate that from 1 to 10, it is1+10 =1,10 ÷ 2 = 5,/kloc-0. Then 1 plus 100 is1+100 =10/0/,100 ÷ 2 = 50,10.

Haha, addition becomes multiplication, fast and accurate. Mathematics is really wonderful, and there is no end to mathematics. Mathematics is really a happy paradise!

Article 3:

Today, my father and I went to Youfang Bridge by subway, from which I learned a truth. We came to the subway first and found that there were 19 stations in the subway. Each stop is 2 minutes, and the stop time is 1 minute and 30 seconds. At this time, my father gave me a difficult problem: How many minutes does it take from Jing Tian Road to Youfang Bridge?

I thought for a moment: "19 minus 1 equal to 18, 18 times 2 equals 36, 18 times 1 minute 30 seconds equals 1 hour 1 hour.

Dad smiled and said, "Your algorithm is not very simple. First subtract 19 from 1 equal to 18, so that you know a * * * with 18 parking times, plus 1 minute 30 seconds equals 3 minutes 30 seconds, and then multiply it by 65438. " Do you think this method is simpler than yours? "I nodded my head.

By taking the subway this time, I understand that although there are many math problems in life, some math problems are not easy, waiting for us to calculate them easily. In the future, I must study math seriously to solve more math problems.