The easy way to 99 15? The easy way to 88x25 11 4?

As follows:

Analysis: First consider 99 as 100-1, and then divide according to the multiplication property.

Make the calculations. 99x15

100-1) x15 (write 99 as 100-1) 100x15-1x15 (multiply the sum of two numbers by one number, you can multiply them by this number separately).

1500-15 (multiplied by subtracting).

The relevant laws of the easy method calculation1. Addition commutative law: two additions exchange positions, and the sum is invariant, which is called the addition commutative law.

Letter formula: a+b+c=a+c+b

2. Associative law of addition.

Adding the first two numbers, or adding the last two numbers first, and the invariant is called the additive associative law.

Letter formula: a+b+c=a+(b+c).

Simple calculation 99 15

The core of simple operation is to use the laws of addition and multiplication to calculate, and calculate the integer part to facilitate the subsequent calculation. Problem solving process:

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

1500-15=1485 is a simple calculation process.

The easy way to get 99 15 is 100 15-15 = 1485, which is a math problem in elementary school.

The simple algorithm for this problem is to replace 99 with (100 1), and then multiply by 15 respectively, so it is equal to 1500-15, and the final result is equal to 1485.

99x15 = (100-1)x15 (write 99 as 100-1) = 100x15-1x15 (multiply the sum of two numbers by one number, you can multiply them by this number separately first.)

99 15 is an easy way to convert 99 into 100-1

Hello! 99 15 = 1485, multiplication vertical operation is shown in the figure below.

First of all, you have to understand that in multiplication and division mixed operations, there is a commutative law. This is the same as the commutative law of addition and subtraction.

For example: 2+5-3+6-7+8=2+5+6+8-3-7 then the same goes for multiplication and division. They are the inverse of each other.

So the original = 88 11 4x25

I hope the above is helpful to you. If recognized,!

In the equation, multiplication and division are calculated first, and then addition and subtraction are calculated, and there is no order of multiplication and division, but you can't add parentheses casually.

This problem 88 is an integer multiple of 11, 25 4 = 100, then the simple algorithm of this problem is.

88 11 (25 4) = 8 100 = 800, which is a problem that uses the swap position algorithm and is suitable for the equation that can be divided or multiplied after swapping.

Because it's all division and multiplication, you can do whatever you want, for example, if you first multiply 25 times 4 = 100, then 100, 88 = 8800. Then use 8800 11 equals 800

This is very simple, this equation can change the position of 25 and 88, and the equation will not change, that is, it becomes 25*88 11*4, and then calculate 88 11=8, that is, 25*8*4=200*4=800

Solution: 666666666666 You can use the multiplication method to assign the lead of the legal bridge to 222222222222 3, multiply 3 with the good 333333333333 of Minqiao, and then use the splitting method to decompose the result 999999999999 to (10000000000000-1) and then multiply it with the 222222222222, and subtract their products after the widest pair. Calculation process.

222222222222x999999999999

The calculation method of the simple argument is as follows.

1. Extract the original formula: 25 7x4 6

2. Calculation process:

25x4x(7x6)

100x42

3. Calculation result: 4200

4. Thank you and look forward to hearing from you. Quietly.

You can use 25 4 first, and then multiply the other two digits after the source of the trapped acre. The simple algorithm is as follows: 25 4 6 7 = 100 6 7 = 600 7 = 4200. Wang Zhu.

The easy way to solve this kind of problem is to exchange positions, pay attention to the empty acres when exchanging positions, with the operation symbol in front of the number.

If you want to use the method of Jianqiao Weichun, Minnai then multiplication and division can be exchanged with each other. We can directly count it as 2 45 9 11. Then 90 9 11, and finally equal to 110

11 9 times, with the simple method of 2 15, if it is according to the normal simple calculation of the rent and dust difference method, then it is also easier to calculate, so four or five points are a lot of people, then the three brothers can enter and exit in a few minutes.