9+1 = 10 = 1+0 = 1; 9*1 = 9;
9+2 = 11 = 1+1 = 2; 9*2 = 18 = 1+8 = 9;
9+3 = 12 = 1+2 = 3; 9*3 = 27 = 2+7 = 9;
9+4 = 13 = 1+3 = 4; 9*4= 36 = 3+6 =9;
9+5 = 14 = 1+4= 5; 9*5= 45 = 4+5=9;
9+6 = 15 = 1+5 = 6; 9*6= 54 = 5+4=9;
9+7 = 16 = 1+6 = 7; 9*7 = 63 = 6+3= 9;
9+8 = 17 = 1+7 = 8; 9*8 = 72 = 7+2 = 9;
9+9 = 18 = 1+8 = 9; 9*9 = 81 = 8+1 =9;
This what I was observed when I am adding phone number to a single number. suppose number 1234 = 1+2+3+4=10=1+0=1, if u add 9 to this number 1234+9 = 1243 =1+2+4+3=10=1+0=1 it is same as before number sum. It is applicable to any number. Can anyone tell the reason why it is happening ?? ( I know the reason.. :P)
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3 comments:
I know the reason for adding 9 .... because it decreases 1 in the ones place and adds 1 to the tens place and so the sum doesn't change B-)
Yaa, you may correct for addition, what abt multiplication??,, :)
"multiplication is repeated addition"
9*2 = 9 + 9 ... so same logic
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