Multiply by 19: Multiply by 20 and subtract the original number.
Multiply by 19: Multiply by 20 and subtract the original number.
Saurabh Mishra , 11 Years ago
Grade 11
6 grade maths> maths-trick...
1 Answers
Parvez ali
Last Activity: 11 Years ago
yes it is true
19*n = (20-1)*n
= 20*n-1*n
= 20*n-n
Thanks & Regards
Parvez Ali
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