Keywords: Digital Ten Brothers, Grade Five, Primary School

This article is suitable for: the fifth grade of primary school.

Composition source:

This diary is about the fifth grade of primary school. The title is "Ten Brothers in Numbers". Everyone is welcome to contribute.

The number "ten brothers"

In our life, there is such a special "family" with ten "brothers". Do you know their names? Yes, they are: one, two, three, four, five, six, seven, eight, nine and zero.

Next, let me introduce the number "Ten Brothers" to you.

odd number

Do you know what an odd number is? I think everyone must know that odd numbers are also called "odd numbers" and numbers that are not divisible by "2" are called "odd numbers". For example, 1, 3, 5, 7, 9 ... but odd numbers are divided into positive odd numbers and negative odd numbers. Add a negative sign before an integer becomes a negative odd number.

even number

I think it's easy to distinguish even numbers when everyone knows odd numbers. Yes, even numbers are even numbers, and numbers divisible by "2" are even numbers. 2, 4, 6, 8, 10 ... these numbers are even numbers. In addition, in 2002, the International Mathematical Association officially classified the "little brother" and "0" which are often ignored by people as even numbers.

decimal

This decimal is amazing. No matter how many zeros are added to the last decimal place, the size of this number will not change (but the counting unit will change). The decimal point is also very imposing. If you move one position to the left, the number will decrease by 10 times, while if you move one position to the right, the number will increase by 10 times.

mark

Fraction, as its name implies, is to divide a whole into equal parts and take one or several of them. Fraction consists of three parts: numerator, fractional line and denominator. With the fractional line as the boundary, the upper number is the numerator and the lower number is the denominator. We can clearly remember that mothers always put their children on top. ...

per cent

A percentage is a fraction with a denominator of one hundred. Percentage is also called percentage or percentage. If you want to convert percentages into decimals, you must move two places to the left and remove the percent sign.

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Don't underestimate these ten "brothers", they have great skills. You can not only do things by yourself, but also work together to make impressive things.

What can they do? Let's outline one or two.

The first skill-counting

"... four, five, six ..." I think everyone can count? So, if you are not allowed to use these little brothers, will you be in trouble? Yes, the first skill of the "Ten Brothers" is counting. Only by counting can we know how many apples and pears are in the basket; Only by counting, can we know how tall and how heavy we are ... If the object to be measured is too high or too big, ten "brothers" will hold together tightly to form a new number, which can be two or three ... Sometimes they will invite their "relatives and friends" to help them when they encounter decimals or fractions.

The second skill-calculation

Next, I will introduce their second skill-calculation. When calculating, they will ask their "neighbors"-addition, subtraction, multiplication and division … for help. With calculation, the mathematical world will have so much fun, and there will be a mysterious "problem solving" that people are interested in today.

In terms of calculation, it should be clear that multiplication and division is the boss, and in a formula, calculation must be made first. However, this is only one of the situations. Sometimes addition and subtraction are not convinced, please use parentheses and square brackets to help. In this case, we should first calculate the numbers in brackets, then the numbers in brackets, and finally the numbers outside brackets.

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Numbers are like a key, which opens the treasure house of knowledge; Numbers are like magical magicians, making the world more colorful. ...

Only when the numbers are unified can we add countless fun to life. If we all unite, the world will become more harmonious and beautiful.

Self-evaluation: This is our math homework today. Let's write a math diary or a short essay. How to write something new? Writing about shopping is an old story; The experience of writing and doing the problem is nothing ... After thinking about it, I decided to summarize the digital knowledge I learned in primary school from different angles. I hope I can get some advice from big and small bloggers. thank you