Multiplying with 9
To multiply 81 with 9
1. add 0 at the end of the number i.e. 810
2. Subtract original number from the new number i.e. 810-81 = 729. This rule works every time. The only thing is that it gets a little cumbersome when you are dealing with mid sized numbers says a 4 digit number or so.
Try the following
82*9,79*9,26*9
To multiply 81 with 9
1. add 0 at the end of the number i.e. 810
2. Subtract original number from the new number i.e. 810-81 = 729. This rule works every time. The only thing is that it gets a little cumbersome when you are dealing with mid sized numbers says a 4 digit number or so.
Try the following
82*9,79*9,26*9
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