Layfkhaki in mathematics. 4 mathematical life hacking, which will simplify the work with examples
1) Multiplication by 11.
When multiplying any two-digit number by 11, we simply add this number between ourselves and insert the resulting number between the multiplied and we get the answer.
2) folding the column. To make it faster and smarter, once again without straining the convolutions, we simply in each column first add the numbers that result in 10. 1 and 9, 2 and 8, 3 and 7, 4 and 6, 5 and 5.
We get as much as a dozen, and the remaining numbers are already added to them. If you adapt yourself, you can add such examples at least 2 times faster, and even in 3.
3) Subtraction is the opposite. If you move away from the usual subtraction and begin to subtract not from left to right, but vice versa, you can do it 3 times faster and not keep all tens in my head.
It is a pity that the method is only suitable when subtracting from round numbers. Or maybe not.
4) 2 + 2 = 5 or 18, and the earth is flat
5) Division by 5. To divide by 5, you can use the formula. First, divide this number by 10, and then multiply by 2.
It would seem that here we have to do unnecessary actions. But if you compare, then these 2 actions, (division by 10 and multiplication by 2) are made easier and faster than that one (division by 5)
Write in the comments what lifehacks you know
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20 сен 2024
