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Application: Pioneer Machinery Factory uses 120 tons of coal this year, and plans to use 105 tons of coal every year. What percentage does it plan to save every year? How to do
The annual plan is to deposit 15%.

Solution: It is known that the coal consumption this year is 120 tons, and it is planned to use 105 tons next year.

The planned coal saving is120-105 =15 tons.

Then the percentage saved compared with this year is15 ÷120 x100% =12.5%.

That is, it is planned to deposit 15% next year.

Multiplication operation property

Multiply the product of several numbers by a number so that any factor in the product can be multiplied by this number and then multiplied by other numbers. For example: (25×3 × 9)×4=25×4×3×9=2700.

Multiply a number by the difference between two numbers, and you can multiply the minuend and the minuend by this number respectively, and then subtract the product.

Refer to the above content: Baidu Encyclopedia-Four Arithmetic

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