How fast can you add 1+2+3+4+5+6+7+8+9+10? In four seconds? What about all the numbers 1 to 100? This video shows a fast and easy math trick that will have you adding series of numbers so fast you will not believe it! This uses the ideas of averages, as you will see in the math trick lesson. To donate to the tecmath channel: To donate to the tecmath channel: To support tecmath on Patreon: To buy tecmath mechandise: