1. Find the formula of how much more this year is than last year: (this year-last year)/last year.

2. Find the formula of how much less last year is than this year: (this year-last year)/this year.

3. The formula of how much this year is last year: this year/last year.

Second, I'll tell you why, and the analysis is as follows:

This is the problem of finding the scores of the known "comparative quantity" and "standard quantity" in primary schools. There is a formula:

Score = comparison quantity/standard quantity.

The so-called "standard quantity" refers to the quantity as a benchmark (standard), that is, the quantity to be compared. That is, treat it as a whole 1 and be the denominator in the formula. The so-called "comparison quantity" is the quantity used to compare with the "standard quantity" and is used as a molecule in the formula. The so-called "fraction" is the ratio of one number to another, that is, the ratio of "comparison quantity" to "standard quantity", which can be a fraction, decimal or percentage. The purpose of solving this problem is to find out who is the "comparative quantity" and who is the "standard quantity", among which finding the "standard quantity" is the key.

1. How much more this year than last year?

If you can't understand the sentence "no", I'll teach you a way. Remember that "more than who or less than who" is the "standard quantity" based on the quantity after "than". This topic means "this year is more than last year", and "than" is followed by "last year", so we should take last year's quantity as the "standard quantity", that is, the denominator and take more than last year's quantity. "How much is this year more than last year" means "how much is this year more than last year", and it can also be said that "how much is this year more than last year". According to the hypothesis of upstairs male benevolence 10 10 friend, it should be X× A% = Y-X, A% = (Y-X)/X = Y/X- 1, not Y× A% = Y-X% = (Y-X)

The final formula is: (quantity this year-quantity last year)/quantity last year.

For example, last year, the store sold 6.5438+0.6 million pieces, and this year it sold 200,000 pieces. How much more than last year?

Method 1, step-by-step solution:

(1) How many pieces have been sold this year compared with last year?

Formula: 20- 16=4 (ten thousand pieces)

(2) Compared with last year, how much has your sales volume increased this year?

Formula: 4/ 16=0.25=25%

A: It sold 25% more this year than last year.

Method 2, comprehensive formula solution:

Formula: (20-16)/16 = 4/16 = 0.25 = 25%.

A: It sold 25% more this year than last year.

2. It is required that last year be a few percentage points less than this year.

Know how to do the 1 question and you will know how to do the second question. After "than" is this year, so it is a comparison with this year. This year's quantity is "standard quantity", which is the denominator. As a "comparative quantity", the quantity less last year (that is, the quantity more this year than last year = the quantity this year-the quantity last year) is a molecule. How much less last year than this year? Or is it a few percent less than this year?

The final formula is: (quantity this year-quantity last year)/quantity this year.

For example, last year, the store sold 6.5438+0.6 million pieces, and this year it sold 200,000 pieces. How much less was sold last year than this year?

Method 1, step-by-step solution:

(1) How many pieces were sold less last year than this year?

Formula: 20- 16=4 (ten thousand pieces)

(2) What percentage of sales volume was less than that of gold last year?

Formula: 4/20=0.2=20%

A: Last year it was 20% less than this year.

Method 2, comprehensive formula solution:

Formula: (20- 16)/20=4/20=0.2=20%

A: Last year it was 20% less than this year.

3. What percentage is this year compared with last year?

This is the simplest one. "What percentage of last year is this year" means "What percentage of last year is this year's quantity", so this year's quantity is a "comparative quantity" and last year's quantity is a "standard quantity", which is the denominator.

The final formula is: quantity this year/quantity last year.

For example, last year, the store sold 6.5438+0.6 million pieces, and this year it sold 200,000 pieces. What percentage of the goods sold this year are those sold last year?

Formula: 20/16 =1.25 =125%

A: The number of goods sold this year is 125% of last year's.