Ive been estimating my 2/3 of the pot and am wondering if its a bad way to estimate.


Here is how I estimate 2/3
Say Pot = $3 (even though its obviously $2)

I multiply by 7 and move the decimal over, 3*7= 21

Gives me $2.1 , just over 2/3 .

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say Pot=$1.76, bit trickier in the head

1*7=7 , ($0.70 )
7*7=49 (call it $.50)

2/3 is $1.30 , which is nearer 3/4 .
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Does any one use a more accurate 2/3 estimation method ?