Easy way to calculate? Calculate in an easy way?

Math Easy Calculation Method:

1. Simple calculation using the multiplicative distributive law.

The most common method used in simple calculations is the multiplicative distributive property. The multiplicative distributive property refers to:

ax(b+c)=axb+axc

cx（a-b）=axc-bxc

Example 1: 38x101, how do we dismantle it? See who is closer to the whole hundred or ten, of course 101 is better, then we can split 101 into 100+1.

38x101

38x（100+1）

38x100+38x1

Example 2: 47x98, how to disassemble it? To dismantle 98, bring it closer to 100.

47x9847x（100-2）

47x100-47x2

Second, the benchmark number method.

Find a compromise number in a series of numbers to represent all numbers, and remember that the number should not be selected to deviate from this series of numbers. Example:

2062x5）+10-10-20+21

3. Addition combined with law.

The use of the associative law of addition (a b) c=a (b c) allows for easier operations by changing the position of the additive. Example:

Fourth, the splitting method.

As the name suggests, the splitting method is to split a number into several numbers for the convenience of calculation. This requires mastering some "good friends" such as: 2 and 5, 4 and 5, 2 and, 4 and, 8 and so on. Be careful not to change the size of the number! Example:

5. Extracting the common factor method.

This method actually uses the multiplicative distributive property to extract the same factors. Example:

The easy way is to consider the easy results to be solved first, and then it is easier to get the final result.

An easy way to do the matching?

Solution: Original formula = 5 + touch the source of laughter.

You say it's an easy way to calculate. What are you calculating, there's nothing else, just like that, I can't tell you anything.

Calculate in a simple way: (88+268) divided by (116-27) This direct calculation is enough! i.e.: 356 89 = 4

This question is just a direct calculation, 356 89 = 4

Solution: The first beam should be 3 (3x5).

Original = 3 [1 (3 5)+1 (5x7)+....1 (23 25)]3 2x(1 3-1 slag yard 25).

3 2 2 22 75

Original = 3 5 + (Chainback 3 Nian Calling Number 2) (1 Boy Shou 5-1 7+1 7-1 9+......1/23-1/25）

The following laws and properties of operation can be used to perform simple calculations.

Commutative law of addition: a+b=b+a

Additive associative law: a+b+c=a+(b+c).

Commutative law of multiplication: a b = b a

Multiplicative associativity: a b c = a (b c).

Multiplicative distributive property: (a+b) c=a c+b c properties of subtraction: a-b-c=a-(b+c) a-b+c=a-(b-c).

The property of division: a b c=a (b c) a b c=a (b c).

For example: 8x (25x15).

4x2)x(25x15)

4x25)x(2x15)

100x30

5x4x5x20

5x5x4x20

25x4x20

100x20

25x7x4x3

25x4)x(7x3)

100x21

15x32x25

15x(4x8)x25

15x8)x(25x4)

120x100

3800÷(25x4)

1600÷(125x8)

25x825x4x2100x2

102x99

102x(100-1)

102x100-102x1

382x101-382

382x101-382x1

382x(101-1)

382x100

35x8-4x35

35x(8-4)35x4

136x101-136

136x101-136x1

136x(101-1)

136x100

4600/(25x4)

4625x15x4

25x4x15

100x15

99x126

126x(100-1)

126x100-126x1

120 (1/3-1/4).

120 (4/12-3/12).

120 1/12

7516x4+16x6x16

16x4+96x16

16x(4+96)

16x100

1 and 1 2125x24

125x8x3

1000x3

26x15(20+6)x15

20x15+6x15

25x99x4

25x4x99

100x99

250x32

250x4x8

1000x8

98+98+98+98)x25

4x98x25

4x25x98

100x98

4800÷(25x4)

1x1==(

4800÷(25x4)

1x1==(

9/17x8/13+8/13/(17/8)=9/17x8/13+8/13x8/17

8/13x(9/17+8/17)

8/13x1

89x(89x10