19x18=? Surprise your maths teacher with this must-know hack.
Suppose we want to find 13x12= ?
Let us start:
therefore: 13x12= 150+6= 156
an other example:
therefore: 15x19= 240+45= 285
next let us calculate 18x17=?
therefore: 250+56= 306
next we calculate 14x18=?
therefore: 220+32= 252
The trick is working only for two numbers between 0 and 19.
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