How to write the verification process of 900 200 ten 300?

Off-form calculation 900-200+300

Solution: Four rules of operation (calculated in order, multiplication and division first, then addition and subtraction, parentheses are counted first, and power is calculated first), that is, the off-form operation (recursive equality calculation) needs to be carried out under the premise of this principle. Problem solving process:

Extended Data - Calculation Result: The single digit of the two added numbers is aligned, and then the numbers on the same counting unit are added together, and the addition result is 10 to the high position, and the high level needs to be added to the low position to 1.

Problem solving: Step 1: 0+0=0

Step 2: 0+0=0

Step 3: 7+3=0 1 to the high position

According to the above calculation steps, the combined calculation result is 1000

If you have any doubts, please ask and be satisfied.

900 minus 200 + 300 check process. 900 minus 200 + 300 check process.

This order can be adjusted to each other, so you can calculate from front to back. This order can be adjusted to each other, so you can calculate from front to back. You can reverse the order when you check it.

900+300-200=1000.So the result is the same as the previous calculation.

Check: 1000-300+200

In the case of calculation, the result is generally substituted into a reverse deduction, adding and subtracting, and subtracting and adding.

Calculate 900-200+300=1000 first.

The check is to use 1000-300+200=900.

This question can be settled sequentially.

Solution: 900-299=601, the check is as follows:

or: 900-601=299).

The one you calculated is wrong, so let's change it.

900-299=601, so we should conclude that the result of the state is 601, which requires you to calculate the sailor through the column vertical, if your number is incorrect, you need to change it, and then the process of checking is to list the equation of the addition of the name, that is, 601 + 299 = 900.

In the process of checking this problem, use it to subtract the result equal to 600 11 in 611 + 299, and wait for 900

The calculation check is to clear the socks and calculate to verify whether the answer is correct or not. 900 299 601, Lu Haofu is 601 + 299 900, which means that the answer to 601 is correct.

Easy way.

Check the constant key and jujube gauge method.

The manuscript is dismantled with 601 is the correct solution. Shed.

There can be two kinds of cracks in the calculation, and one can be selected by any of the bureaus

Answer: Because: 900-299 = 601

The belief is based on: 601 + 299 = 900 or 900 - 601 = 299. Slippery oranges can be checked in this way. Nuclear ants.

Solution: 900-299=601, the check is as follows:

or: 900-601=299).

First of all, 300 900 refers to all the numbers between 300 and 900. If you want to calculate the sum of these numbers, you can use the formula for summing the series of equal differences: s = n * a1 an) 2, where n represents the number of numbers (i.e. (900-300) 100 1), a1 means the number made by the silver of the series, and the front balance an represents the last number of the series.

Then, substituting the formula for null gives s = 6000, that is, the sum of all numbers between 300 and 900 is 6000.

According to the query mathematical formula, the code is 900-300 60=900-5=895 and the calculation is 895+5=900? 60*5=300？To put it simply: it is to check subtraction, use addition; He Dou calculates and divides, and uses the multiplication mold grinding method.

The method of 1000-342 check is as follows, in the subtraction check, we can use the subtracted difference to check the calculation. We can also use the difference plus or minus for the check.

In addition, we can use the position of the two additions to be reversed.

We can also use and subtract one of the additions for the check.

In fact, it is to change 1000-342 to 999-342+1 to calculate. The last 1 is added to the single digit, so it adds up to 10. There is no need to think about abdication, just start adding from the hundred.

How to calculate 1000-342, do a good calculation, this is a subtraction problem, you can use the difference plus the subtraction to check, first, use 1000-342 to get 658, use 658 plus 342, if you get 1000, it's right.