Multiply Any two numbers near 100 (FAST) | Math Trick

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This video is a tutorial on multiplying two numbers near 100 extremely fast. This trick can be used for any two numbers, but it works best for numbers between 80 and 120.
If you liked this video, you will also like the other videos in the Math Tricks playlist.

Timestamps:
0:00 - 93 x 103
1:06 - 107 x 98
1:53 - 112 x 91
2:58 - 109 x 89
3:40 - Practice worksheet and answers

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Here's the links to the practice and answers

crunchmath
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Why 96 -1 ?i don’t understand where comes this 1 from

protheole