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GeneralRe: Mental arithmetic Pin
Stuart Dootson17-Aug-20 22:12
professionalStuart Dootson17-Aug-20 22:12 
GeneralRe: Mental arithmetic Pin
Menuki17-Aug-20 22:34
MemberMenuki17-Aug-20 22:34 
GeneralRe: Mental arithmetic Pin
Member 4317199 (Paddy)17-Aug-20 23:29
MemberMember 4317199 (Paddy)17-Aug-20 23:29 
GeneralRe: Mental arithmetic Pin
Jörgen Andersson18-Aug-20 3:56
professionalJörgen Andersson18-Aug-20 3:56 
GeneralRe: Mental arithmetic Pin
Martin ISDN17-Aug-20 23:29
MemberMartin ISDN17-Aug-20 23:29 
GeneralRe: Mental arithmetic Pin
Member 1157700818-Aug-20 2:06
MemberMember 1157700818-Aug-20 2:06 
GeneralRe: Mental arithmetic Pin
Jörgen Andersson18-Aug-20 3:59
professionalJörgen Andersson18-Aug-20 3:59 
GeneralRe: Mental arithmetic Pin
asimonassi18-Aug-20 2:27
Memberasimonassi18-Aug-20 2:27 
To solve mentally with no use of paper, I need to imagine 5 squares, made of stones laid out on a table.

we have first square that is made of 10x10 red stones.

second square is made of 10x10 red stones plus 1x10 green stones at top and 10x1 green stones at right, then to fill the square we have a 1x1 square of blue stones at top right corner.


third square is made of 10x10 red stones plus 2x10 green stones at top and 10x2 green stones at right, we fill the square with 2x2 stones.

etc...

red stones are 500 (5x10x10)
green stones are 200 (20 on second square, 40 on third, 60 on fourth, 80 on fifth)
blue stones (squares of 1, 2, 3, 4) are 1+4+9+16 = 30

total 730 stones.

730 / 365 = 2.
GeneralRe: Mental arithmetic Pin
Jörgen Andersson18-Aug-20 4:01
professionalJörgen Andersson18-Aug-20 4:01 
GeneralRe: Mental arithmetic Pin
arndibble18-Aug-20 2:34
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GeneralRe: Mental arithmetic Pin
John Godin18-Aug-20 2:57
MemberJohn Godin18-Aug-20 2:57 
GeneralRe: Mental arithmetic Pin
avanishrayankula18-Aug-20 5:01
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GeneralRe: Mental arithmetic Pin
Member 1146760818-Aug-20 6:04
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GeneralRe: Mental arithmetic Pin
jsrjsr18-Aug-20 16:26
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GeneralRe: Mental arithmetic Pin
megaadam18-Aug-20 23:33
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GeneralRe: Mental arithmetic Pin
Member 1477127419-Aug-20 5:36
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GeneralRe: Mental arithmetic Pin
Stan Rydz19-Aug-20 8:04
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GeneralRe: Mental arithmetic Pin
MrChug19-Aug-20 16:47
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GeneralRe: Mental arithmetic Pin
Kurosh F.30-Aug-20 5:30
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GeneralRe: Mental arithmetic Pin
Member 85731432-Sep-20 20:35
MemberMember 85731432-Sep-20 20:35 
GeneralThought of the Day Pin
OriginalGriff17-Aug-20 4:31
mveOriginalGriff17-Aug-20 4:31 
GeneralRe: Thought of the Day Pin
W Balboos, GHB17-Aug-20 5:10
mveW Balboos, GHB17-Aug-20 5:10 
GeneralRe: Thought of the Day Pin
Daniel Pfeffer17-Aug-20 5:53
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GeneralRe: Thought of the Day Pin
jsc4217-Aug-20 6:58
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Mike Hankey17-Aug-20 6:47
professionalMike Hankey17-Aug-20 6:47 

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