Counting eggs-(math diary 14 It's sunny on Friday in August)

Topic: Counting Eggs-(math diary/KLOC-It's sunny on Friday, 0/4)

Keywords: Egg Zhou Xiao, Grade One,

This article applies to: the first grade of primary school.

Composition source:

This essay is about the first grade of primary school. The topic is: Counting Eggs-(math diary 14 It was sunny on Friday, August). Everyone is welcome to contribute.

Dad brought back a box of eggs called Nanyang Sanqing Egg, which was laid by a Sanqing chicken with green legs and a green mouth in Nanyang.

"Now let's put the eggs in the refrigerator. It's hot, but it won't break. " Mom said and opened the carton. She took out the eggs layer by layer and put them on the table. Order me to count how many eggs are in a * * *. This is a piece of cake. I began to count one by one loudly, counting to the first floor, *** 15, and then to the second floor: 16,17-my mother suddenly said, "Oh, one by one. This method is stupid. It should be calculated in a simpler way. Think about it. "

Oh, I see. There are three rows on the first floor, with five in each row. It should be 5+5+5= 15 (one). "How to calculate multiplication?" Mom asked me again. I looked at my mother's face and thought. She taught me that the addition of several identical numbers can be expressed by multiplication, and several numbers are multiples of one number. Now there are three fives, which should be 3×5= 15 (one). Mom said: You know there are 15 eggs on the first floor, and now there are four floors. How many eggs are there in that * * *? How many ways can you work out?

I know: the first 15+ 15+ 15, the total is equal to:15+15 = 30,30+15 = 45,45+655.

The second type: 2 floors and 2 floors can be calculated as 15+ 15=30, 30+30=60 (units).

Mother clapped her hands and laughed. What else?

Multiply it up to 4× 15=60 (pieces).

Mom smiled and said, "Great! You can eat this egg. " I'm glad to hear the news.

"However, only you can't eat eggs, and children in disaster areas can't eat them. If you give them these 60 eggs, each child will be divided into two. How many children can eat your eggs? " Mom asked again.

It doesn't bother me either. "There are 30 children," I said loudly, that is, how many 2' s are in 60. Divided by 60÷2=30 (person).

"Very well, son! Mom didn't teach you for nothing. " Mother kissed me on the forehead.

I am proud that so many math problems are really interesting!