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```
multiply by 9 if you add the answers digits together, you get 9. Example: 9×5=45 and 4+5=9. (But not with 9×11=99)

```
6 years ago Nishant Vora
IIT Patna
2467 Points
```							Hello Student,Please post your question properly.Thanks,______________________________________________________________________________________________________________________________________________________________________________________
```
5 years ago
```							ROHAN, ALL THE MULTIPLE OF 9 from 1 to infinite . LIKE-9 X 1=09 and 0+9=99 x 2=18 and 1+8=9 in this way 9x11=99 and 9+9=18 and here 1+8=again 9.9x1=9 and 0+9=99x2=18 and 1+8=99x3=27 and 2+7=9........and so on like 999999999999999999999999999999999999999999 X 1= 999999999999999999999999999999999999999999 and when we plus 9+9+9+9and so on and we plus the result till its a single digit and we see a magic, its 9.
```
5 years ago
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