12 Useful Math Hacks You Didn’t Learn At School

07. How To Multiply Large Numbers In Your Head

12 Useful Math Hacks You Didn't Learn At School-How To Multiply Large Numbers In Your Head

Image: imgur / MoonnMan

08. How To Remember Which Sign Is Greater Than and Which Is Less Than

12 Useful Math Hacks You Didn't Learn At School-How To Remember Which Sign Is Greater Than and Which Is Less Than

Image: ducksters

09. How To Find Fractions Of Whole Numbers

12 Useful Math Hacks You Didn't Learn At School-Trick to Find Fractions Of Whole Numbers

Image: imgur / ayounes

10. How To Multiply By 11

12 Useful Math Hacks You Didn't Learn At School-Trick to Multiplying By 11

Image: WonderHowTo

11. How To Use Your Hands For 5, 6, and 9 Times Tables

12 Useful Math Hacks You Didn't Learn At School-How To Use Your Hands For 5, 6, and 9 Times Tables

Image: instructables / misko13

12. Use Lines To Multiply

12 Useful Math Hacks You Didn't Learn At School-Use Lines To Multiply

Image: school-exercise-books

The above is actually a method used often by the Japanese. Here is video for better demonstration:

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