arithmetic is one of the basic mathematical branches that includes addition, reduction, multiplication and division. Master these skills not only make it easier for many aspects of everyday life, but also improve math in general. This article provides some tips and tricks that are useful to calculate faster and more efficient.

1. Use Simple Rules

The application of simple rules can increase speed in arithmetic calculations. Here's a few ways to speed up addition and subtraction:

a. Add

• Round numbersFor example, in addition to 48 + 36, you can round up 48 to 50 and calculate 50 + 36 = 86, then subtract 2 of the results to get 84.
• Merge small numbers firstFor example, for 17 + 23 + 16, combine 17 + 23 = 40 first, then add 16 to get 56.

B. Reduction

• Round to make it easyTo calculate 93 - 57, round 93 to 100, do a 100-57 subtract = 43, then reduce 43 with the extra 7 round to get 36.
• Add BackIf it's hard to reduce, try adding small numbers to a large number. For example, for 64 to 39, add 1 to make 39 40, then add 24 to 64. So the result is 25.

2. Quick multiplication

There are some tricks that can ease multiplication:

a. Multiply by 9

• For 9 × 7, subtract 1 from 7 and add the number that makes the total 9, which is 3. The result is 63.
• Another quick trickMultiply the number by 10, then reduce it by the original number. For example, for 9 × 4, do 10 × 4 = 40, then subtract 40 by 4 to get 36.

B. Multiply by 11

• If you multiply two digits by 11, add two digits, and put them between the first and the second. For example, 45 × 11: add 4 + 5 = 9, so that's 495.

C. Close Numbers 10 or 100

• For example, 49 × 6 can be calculated as (50 × 6) - (1 × 6) = 300 - 6 = 294.

d. Split Factor

• If you multiply the large number, try breaking it down into small factors. For example, to calculate 16 × 25, do (4 × 4) × (5 × 5) = 400.

3. Fast Division

For division, use some of the following techniques:

a. Division by 5

• For example, 180 plus 5 can be converted to 180 × 0.2 = 36.

B. Using Round

• If sharing is difficult, round the numbers. So for example, 198, 198, 12 can be rounded up to 200. 10 is equal to 20, and adjust the final results (about 16.5).

C. Stage

• For example, to calculate 462 people who are 21, first for 462 people and then make small adjustments for more accurate results.

Four. Estimated and Estimated

• Estimated is often enough in many cases. To calculate the price of groceries, for example, round the prices to the nearest tens and do a quick addition to the total estimate.

5. Mental Calculator

Practice mental calculator capabilities in some other way:

• Daily matterPractice simple math problems every day to hone the brain.
• Use associativeGet a certain number of things in everyday life to ease the calculation.
• Use pattern: Recognize patterns in numbers to make calculations easier and faster.

Six. Routine practice

Practice consistently is the key to master quick calculations. Use applications or math games that practice arithmetic skills. Besides, it's common to not always use the calculator when doing simple calculations everyday.

Conclusion

Mastering arithmetic is a very useful skill, both in everyday life and in development of mathematical ability. By exploiting various tips and tricks, such as rounding, finding factors, and training mental calculator, you can increase speed and efficiency of calculations. A consistent exercise is the key to making quick calculations a habit.

news source: resienteducator.com