Assorted Multiplication Rules :-

Multiply by 5: Multiply by 10 and divide by 2.


Multiply by 6: Sometimes multiplying by 3 and then 2 is easy.


Multiply by 9: Multiply by 10 and subtract the original number.


Multiply by 12: Multiply by 10 and add twice the original number.


Multiply by 13: Multiply by 3 and add 10 times original number.


Multiply by 14: Multiply by 7 and then multiply by 2


Multiply by 15: Multiply by 10 and add 5 times the original number, as above.


Multiply by 16: You can double four times, if you want to. Or you can multiply by 8 and then by 2.


Multiply by 17: Multiply by 7 and add 10 times original number.


Multiply by 18: Multiply by 20 and subtract twice the original number (which is obvious from the first step).

Multiply by 19: Multiply by 20 and subtract the original number.


Multiply by 24: Multiply by 8 and then multiply by 3.


Multiply by 27: Multiply by 30 and subtract 3 times the original number (which is obvious from the first step).