34 9 What is counted first, then what is counted, and what is counted first, and then what?

To calculate this math problem, we directly use addition and subtraction to calculate 34+9=43, generally speaking, in the ordinary four operations, we often calculate multiplication and division first and then calculate addition and subtraction.

34+9 can be counted first, 34+6 and then +3, so that you get 40+3=43. You can also calculate 4+9=13 first, plus 30 is still equal to 43.

Hello, happy to answer your questions. You can do this with the most simplified calculations. 34 + 9 = 33 + (1 + 9) II 33 + 10 II 43. This algorithm is the most concise and convenient, I hope it will help you.

Two-digit subtraction should start from the single digit, so first calculate 14-9=5, and then calculate the situation of ten digits on the borrowed place, 3-1=2 The final result is 25.

34+9 can be counted as a single digit 4+9=13, so that the single digit is 3, forward one place, and then ten digits are 3+1=4. It is also possible to divide 9 into 10-1, so that 34+10 becomes 44 first, and then 44 minus 1 becomes 43.

34+9 can be counted as 4+9 first, and then 30+13You can also calculate 1+9 first, and then 33+10. The latter is the so-called easy calculation method.

34+9 is counted as a single digit first, then as a ten-digit number, and 9+4=13 is calculated first, and then 30+13=43. If the addition of single digits is a two-digit number, for example: 37+5= then, 5+7=12, then you need to add 1 to the previous digit (ten digits), then it is 30+(5+7)=30+12=42 (remember to count the parentheses first)...

Hello, 34+9 can be calculated as 30+9 first, and then add 4, that is, 30+9+4=43. You can also calculate 35 + 9 first, and then subtract 1, that is, 35 + 9-1 = 44-1 = 43.

34-9 first calculates 14-9=5, and then calculates 3-1=It is a two-digit subtraction, which should be calculated from a single digit, so it is calculated 14-9=5 first, and then the debited position on the ten digits, and the final result of 3-1=2 is 25. This is also the "borrowing ten methods" in mathematics. Anti-exchange rate of subtraction:

Subtraction is anti-commutative if a....

34 + 9 first calculate 4 + 9 = 13 in the calculation of 3 + 1 borrowed a bit of 1, the result is 43

34 plus 9, you can first calculate 34 6 3, which is equal to 40 + 3 = 43

It can also be calculated in this way, 34 + 10 1 = 44 1 = 43

34+9 can be calculated first: 4+9 equals 13, then 30+13 equals 43, and 1+9 equals 10, and then 33+10 equals 43.

Count thirty-four plus six first. Forty plus three, you can also calculate 34 plus ten and then forty-four minus one.

34+9 column calculation, first calculate the single digit 4+9 is equal to 13, write 3 into 1. Count ten digits again, the ten digits are only 3, plus the carry of 1, 3 + 1 ten digits write 4. Final Result 43

You can count 30+9 first, then 39+4. You can also calculate 4+9 first, and then 30+13. That is, to divide the 30 to count.

34 can be divided into 30 and 4, first calculate that 4 + 9 is equal to 13, 13 plus 30 is equal to 43

First of all, you can change 34 to 30+4, then calculate 4+9=13, then 13+30=43

Calculate the single digit 4 + 9 = 13 first, then the ten digits, 30 + 10 = 40, and the result is 43.

If there are parentheses in the arithmetic problem, the ones in the parentheses are counted first, and if there are no parentheses, then they are calculated according to the same level, from left to right. Addition, subtraction, multiplication and division, the symbol is "+- collectively known as the four mixed operations, where addition and subtraction are called first-level operations; Multiplication and division are called second.

Count 40-9 first, then add 4This is the algorithm for kindergarten children.

44-9 is counted first (single digits) and then (ten digits).

Analysis: Examine the nature of subtraction.

Divide 44 into 30 and 14

Count 14-9 5 first

Then count 30+5 35

First count 40-9-2-31, then 31-10-4-235

What does it come first? And what?

34-9=25, 14-9=5 first, and 3-1=2 after the collapse.

The analysis process is as follows:

34-9=25 is a two-digit subtraction, which should be calculated from a single digit, so it is 14-9=5 first, and then the coarse case of the borrowed position on the ten digits, 3-1=2 and finally the rock shirt guess the result is 25.

This is also the "borrowing ten methods" in mathematics.

<>34-9 first calculates 14-9=5, and then calculates 3-1=It is a two-digit subtraction, which should be calculated from a single digit, so it is prudent to calculate 14-9=5 first, and then calculate the debit on the ten digits, and the final result of 3-1=2 is 25. This reed is also the "borrowing ten methods" in mathematics.

Anti-swap rate of subtraction: Subtraction is anti-swap, if a and b are any two numbers, then a-b = - (b+a).

The subtraction of real numbers is defined plus signed numbers. Specifically, the process of subtraction of a number by adding the negative number of another number. And then we have 3?

3+(?This helps to keep the "simplicity" of real numbers by avoiding the introduction of "new" operators such as subtraction.

<> first calculate 14-9=5, then calculate the situation of borrowing on the tenth, 3-1=2, and the final result is 25.

The addition and subtraction of more than two digits are counted as single digits first, then ten digits, and so on. When doing subtraction, if the single digit is not enough, you should borrow one from the ten digits first, and then subtract the operation.

The two-digit addition and subtraction algorithm has:

Sum 10 method: The method of decomposing an addition into the sum of two numbers, so that the decomposed part of it and another addition are added to get 10. The method of making up 10 can transform the carry addition within 20 into the problem of 10 plus several that students are familiar with, so as to make it easy and perform simple calculations.

Breaking ten method: It is a calculation method, when the single digit is not enough to subtract, subtract the subtraction with 10, and add the remaining number and the number on the single digit, that is, the ten breaking method. For example:

To calculate 13-8, we first subtract 8 from 10, leave 2, and then use this 2 to add 3 in the single digit to get 5.

Flat ten method: 15-8, the single digit is not enough to subtract 8, so first subtract the single digit of 5, it becomes a whole 10, and then use 10-3, which is equal to 7. Compared with the flat ten laws, the breaking ten methods are more common.

Two-digit subtraction should start from the single digit, so it is calculated first 14-9=5, and then the debit on the ten digits, and the final result of 3-1=2 is 25

The multi-digit subtraction rule aligns the digits of two multi-digit digits, subtracting from the lower digits, subtracting the numbers on the same digit respectively, as the numbers on the corresponding digits of the difference, which digit is not enough to subtract from the adjacent higher digits to make ten, and then subtract each other, the specific method is as follows:

1. When the number in the nth digit of the subtracted number minus the nth digit of the minus the nth digit of the subtracted number is a single digit, this single digit is the number in the nth digit of the difference.

2. When the number on the nth digit of the subtracted number is less than the number on the nth digit of the minus, borrow one as ten on the higher digit adjacent to the nth digit of the subtracted number, form a two-digit number with the number on the nth digit, and then subtract the number on the nth digit of the subtraction as the number on the nth digit of the difference, and so on, this subtraction is also called borrowing subtraction or abdication subtraction.

34 9 first calculate the single digit to borrow 10 from the ten digits, then 4 minus 9 equals 5, and then calculate the ten digits 3 minus 1 equals 2, which is equal to 29

The first type: 34-9 first borrow 1 from the 10 digit 3, that is, 10, 10 and the single digit 4 add up to 1414-9 = 5

Ten 3 borrows 1 and leaves 2, which is 20 + 5 = 25

The second type: 34-9 borrows 1 from the 10-digit 3, which is 10, 10-9 = 1The next digit of 4 is equal to 5, and the ten digits of 3 borrow 1 and leave 2, which is 20+5=25

Now in general, the teacher teaches the child what is like 34-9, first of all, take out a 10-9 from 30, and then give 40 again. This results in 25 students more easily understood.

Decomposed 9,9 = 5+4

Isn't it also to teach children algorithm skills?

You can start with 34-4 and then 30-5 for 25

36 + 9, you can calculate 36 + 4 = 40 first, and then 40 + 5 = 45

You can also calculate 6 + 9 = 15 first, and then 30 + 15 = 45

<> we can use the method of making up ten methods and the method of dismantling or rubbing and dividing.