Why 0.9999… Equals 1
February 4th, 2017 by Math Tricks  3 Comments  Filed in Math Tricks
Here is an illustration as to why 0.9999 (dot, dot, dot . . . ) is equal to one:
Do you see a problem with this “proof”?
Tags: Rounding Up
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Here is an illustration as to why 0.9999 (dot, dot, dot . . . ) is equal to one:
Do you see a problem with this “proof”?
Tags: Rounding Up
By Ernesto Zuniga
First let me say that I am not an advanced mathematician. I find myself trying to see patterns in numbers and things around me. Call this the Tier System for multiplying any two digit number by 12 through 19. It is meant to be learned so that you can do fast calculations in your mind. Below you will see how to multiply any number by twelve. The steps outlined will apply to all tiers from 13 to 19 as well. This will make sense when you learn how to multiply any number by thirteen. So here are the steps do doing this. With practice doing this will be automatic. Share this with children who are learning how to multiply.
So here are the steps to doing this.
Let’s try a couple.
51
We know it ends in 2.
Steps 2 and 3 give me a result of 61
Step 4 gives us 612.
51 x 12 = 612
Here’s another one.
95
We know it ends in 0.
Steps 2 and 3 gives us a result of 114
Step 4 gives us 1140
95 x 12 = 1140.
Below is a visual of the Tier System as it applies to multiplying two digit numbers by twelve.
Tags: Math Tricks