876 298 How to do simple calculations

The 876-298 simple operation method is as follows:

Since 289 is close to 300, it is easier to calculate 289 as (300-2). Easy to calculate.

The laws of arithmetic and the basic properties of numbers are used to make the calculation easy and make it easy to calculate the number of a very complex formula.

A simple calculation of 778-199 is shown below.

778-199 is a simple calculation, you can turn 199 into 200-1, and then the calculation is very simple.

Through observation, it can be found that the number 199 is closest to the integer 200, 199=200-1, then the original becomes 778-(200-1), after removing the parentheses, it becomes 778-200+1, which is equal to 578+1, which is equal to 579

It's a simple calculation. 99×99+199=99x99+100+99x1=99x（99+1）+100=99x100+100x1=100x（99+1）999×778+333×66=999x778+999x222=999x222=999x（778+222）=999x1000=999000

The front can be left alone, but 199 can be seen as 200 minus 1. So the feast becomes 778-200 plus 1. It is equal to 578 + 1 = 579. Which type is so it is a simple rounding method. Slow down.

This is a mathematical problem of addition and subtraction, the form of calculation, so according to the requirements and characteristics of the problem, the simple calculation method should be 778-(200-1) is equal to 778-200+1 is equal to 577, so the calculation of mathematical hydrology must be proficient and only master the calculation method will be better. Others.

Use the rounding method: close the sum subtraction and the subtraction to see that the one that is close to the whole hundred is obviously a minus.

778-200+1 (originally 199 more minus the state of congratulations 1 plus the Zen family).

Calculated in an easy way, it can be calculated like this.

The process is as follows.

Original 778-200+1

This is a simple way to calculate.

We can simplify this expression by using the difference product formula $(a-b)(a+b)=a 2-b 2$:

789*(968-969) -788*(969-968) (splits the original expression into two smaller expressions).

789*(969-968) -788*(969-968) (use the difference product formula for each small expression).

Therefore, 789*968-788*969 = 1577.

Transform 789968-788969 into (789-788)*(968+969).

The distributive property is multiplied, i.e., a*(b+c)=ab+ac.

Counting hail starts to rent next to (789-788) (968 + 969), 1 (1937), that is, 1937.

The answer was 1937.

Counting Pi Lu Calculation: Zen Grip Book He Hong.

876-300+2

First subtract 300 because 298 is only two numbers short, which is equal to 300, and then add two because it subtracts two more numbers, and finally the answer is derived.

You can first tease the mountain rotten key 598 to 600-2, because the formula can be written as: 876-(600-2)=876-600+2=276+2=278

876-199 Simple Calculations.

The simple operation of pro 876-199 is as follows: 876-199 = 876 - (200-1) = 876-200 + 1 = 676 + 1 = 677

This is the calculation of mathematical addition, so the simple calculation method should be 837 + 298 = 837 + 300 - 2 = 1137 - 2 = 1135.

Look at 796 as 800-4, 298 as 300-2, and then add or subtract from the base lift.

It can be made up of a whole hundred and then calculated, 796 + 298