Teacher Qian taught us simple multiplication and division these days in order to let us work out the results of some problems faster.

I thought to myself: I can calculate vertically quickly, too.

Is there any other way to make calculation faster? I listened carefully to Mr. Qian's lecture with full questions, and finally understood the truth.

It turns out that to simplify the operation, we must first understand the basis of multiplication and division.

The basis of multiplication is: multiply three numbers, you can multiply the last two numbers first, and then multiply the first number, and the result is unchanged.

The basis of division is that a number is divided by two numbers in a row, and when it is divisible every time, you can multiply the two numbers first, and then divide the numbers by their products, and the result remains the same.

Let me give you an example: 25× 16=25×4×4, = 100×4, =400.

How's it going? If you calculate this formula vertically, it will take about one minute, but if you use a simple algorithm to do this formula, you can quickly calculate the result.

Shortly after I learned simple calculation, my father gave me a question and I answered it immediately. I calculated it this way: 35× 12=35×2×6=70×6=420. My father listened to my answer and praised me.

I'll tell you a little knowledge: it's best to find a number and multiply it to get a whole ten or a whole hundred.

Simple algorithm is easy!