Where is the 4th grade math diary? 5

Here are a few:

Math Diary – A Primer on Fractions.

1) Today, our family went to KFC in Longgang to eat the whole family**.

When we got there, there was a crowd of people, and we finally ordered a good meal and found a seat to sit down. The dish is here, it's a big bucket **. There are 12 chicken thighs in it, I think:

How do you average the score? At this point, I remembered the division 12 3=4. We each had four chicken legs, and I later ate 1 chicken leg from my mother and 2 chicken legs from my aunt, and my aunt said:

You can't eat it for nothing, I ask you, how many fractions of a meal have you eaten? How many more servings do you eat and eat them all? "I thought about it,:

I ate 7 12, then 5 12 and I ate it all. "Luckily, I learned about fractions and was able to get the questions right.

2) Today, my mother gave me 10 yuan to go to the supermarket to buy something. I bought a string of firecrackers for 2 10, bought four lollipops for 1 10, bought 7 balloons, used 2 10, and finally bought a comb, used 4 10 for money, and made a total of 2 10 + 1 10 + 2 10 + 4 10 = 9 10. I had to pay my mother back with one dollar left.

When I got home, my mother ate the lollipop's 1 4, my dad ate the lollipop's 1 4, I ate the lollipop's 1 4, and there was one left, which I gave to my brother Xiaoqiang next door to eat. (Author: Sean Ling).

3) Last week, we studied fractions. Fractions have numerators, denominators and fraction lines, for example: 1 3, 3 is the denominator, 1 is the numerator, and the middle horizontal is the fraction line.

There are many places where you need to use fractions in your life, for example: a book has 30 pages, and each page is 1 30 of a book. Fractions can also be used to add or subtract!

For example, one half plus one half equals two in half, which is 1. Why is this so?

If a loaf of bread divides it into two equal parts, each of which is 1 2 of the loaf, and then the two portions are put together, and there are 2 1 2, which is exactly one loaf. When adding and subtracting fractions, if the denominator is the same, ignore the denominator and add the numerators. And the numerator and denominator of 2 2 are the same, which is 1.

I also learned to compare the size of the fraction, and the teacher taught us the formula: the numerator is the same as the denominator, the fraction with the larger denominator is smaller, and the fraction with the smaller denominator is larger; The denominator is the same as the fraction larger than the numerator, and the fraction with the smaller numerator is smaller.

The teacher also reminded us that when writing fractions, we generally write the score line first, which means the average score, then the denominator, and finally the numerator.