this post was submitted on 04 Apr 2025
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For me personally, anything times 5 can be reached by halving the number, then multiplying that number by 10.
Example: 66 x 5 = Y
(66/2) x (5x2) = Y
cancel out the division by creating equal multiplication in the other number
66/2 = 33
5x2 = 10
33 x 10 = Y
33 x 10 = 330
Y = 330