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 Re: Mental arithmetic Stuart Dootson17-Aug-20 22:12 Stuart Dootson 17-Aug-20 22:12
 Re: Mental arithmetic Member 4317199 (Paddy)17-Aug-20 23:29 Member 4317199 (Paddy) 17-Aug-20 23:29
 Re: Mental arithmetic Martin ISDN17-Aug-20 23:29 Martin ISDN 17-Aug-20 23:29
 Re: Mental arithmetic Member 1157700818-Aug-20 2:06 Member 11577008 18-Aug-20 2:06
 Re: Mental arithmetic asimonassi18-Aug-20 2:27 asimonassi 18-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.
 Re: Mental arithmetic arndibble18-Aug-20 2:34 arndibble 18-Aug-20 2:34
 Re: Mental arithmetic John Godin18-Aug-20 2:57 John Godin 18-Aug-20 2:57
 Re: Mental arithmetic avanishrayankula18-Aug-20 5:01 avanishrayankula 18-Aug-20 5:01
 Re: Mental arithmetic Member 1146760818-Aug-20 6:04 Member 11467608 18-Aug-20 6:04
 Re: Mental arithmetic jsrjsr18-Aug-20 16:26 jsrjsr 18-Aug-20 16:26
 Re: Mental arithmetic Member 1477127419-Aug-20 5:36 Member 14771274 19-Aug-20 5:36
 Re: Mental arithmetic Stan Rydz19-Aug-20 8:04 Stan Rydz 19-Aug-20 8:04
 Re: Mental arithmetic MrChug19-Aug-20 16:47 MrChug 19-Aug-20 16:47
 Re: Mental arithmetic Kurosh F.30-Aug-20 5:30 Kurosh F. 30-Aug-20 5:30
 Re: Mental arithmetic Member 85731432-Sep-20 20:35 Member 8573143 2-Sep-20 20:35
 Thought of the Day OriginalGriff17-Aug-20 4:31 OriginalGriff 17-Aug-20 4:31
 Re: Thought of the Day W∴ Balboos, GHB17-Aug-20 5:10 W∴ Balboos, GHB 17-Aug-20 5:10
 Re: Thought of the Day Daniel Pfeffer17-Aug-20 5:53 Daniel Pfeffer 17-Aug-20 5:53
 Re: Thought of the Day jsc4217-Aug-20 6:58 jsc42 17-Aug-20 6:58
 Re: Thought of the Day Mike Hankey17-Aug-20 6:47 Mike Hankey 17-Aug-20 6:47
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