Summary of data analysis and calculation methods

A summary of computing skills for public examination data analysis, and a guide to computing skills. Help candidates master the method of score comparison efficiently. Students in need can save it.

Edited at 2024-11-20 12:24:06

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Summary of data analysis and calculation methods

EllaGrace

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Outline

Summary of data analysis and calculation methods

Score comparison

One big and one small - "There are many people who have less money, but everyone has more money"

Same big, same small

Vertical division - the denominator generally retains a two-digit estimation range (the same number of digits, look at the significant digits; different digits, pay attention to the number of digits)

Horizontal multiples - look at the multiples between the numerator and the denominator

The multiple between molecules is larger. Just look at the molecules. The larger the molecule, the larger the fraction.

If the multiple between the denominators is large, just look at the denominator. The fraction with a large denominator is small.

Compare multiple fractions

reference method

Find the maximum - use the maximum fraction of the numerator as a reference and compare it with other fractions one by one

Find the minimum - use the smallest fraction of the numerator as a comparison and compare it with other fractions one by one

Estimate range - vertical division, the denominator generally retains a 2-digit estimate range

The digits are the same, look at the significant digits

The number of digits is different, please pay attention to the number of digits

truncation

Look at the options first

There is a big gap between options, so keep 2 places

The first digit is different

The first digit is the same, the difference between the second digit is > the first digit

The gap between options is small, 3 digits are reserved.

The first digits are different, but they are critical (29 and 30)

The first digit is the same, the difference between the second digit ≤ the first digit

Look at the formulas listed again

One-step division (divide once): keep the denominator and write one more digit in the numerator

Multi-step division (division multiple times): keep the same number of digits in the numerator and denominator (generally 2 digits)

Appropriate factory removal: look at the options while removing, and stop when enough is enough

Proportional correction

Principle: The numerator and denominator change in equal proportions, and the fractional value remains unchanged.

Operation: Keep the three-digit column formula. The numerator and denominator must be multiples of the original number, and the numbers added and subtracted must also be the same multiple.

application

Current ratio: A/B (the denominator is converted into a hundred)

Base period calculation: A/1 a (the denominator is converted into 100)

Base period sum and difference: A/1 a±B/1 b (the denominators are converted into the same number)

Base period ratio: A/B×1 b/1 a (the following formula is converted to 1)

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