سحر الرياضيات
 

1x 8 + 1 = 9
12x 8 + 2 = 98
123x 8 + 3 = 987
1234x 8 + 4 = 9876
12345x 8 + 5 = 98765
123456x 8 + 6 = 987654
1234567x 8 + 7 = 9876543
12345678x 8 + 8 = 98765432
123456789x 8 + 9 = 987654321

1x 9 + 2 = 11
12x 9 + 3 = 111
123x 9 + 4 = 1111
1234x 9 + 5 = 11111
12345x 9 + 6 = 111111
123456x 9 + 7 = 1111111
1234567x 9 + 8 = 11111111
12345678x 9 + 9 = 111111111
123456789x 9 +10= 1111111111

منقول من http://ecoletigmmiljdid.ning.com

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