MULTIPLICATION BY 9 :Step I: Subtract the right-hand figure of the long number from 10. This gives the right-handIfirgute of the answer.
Step II: Taking The next digit from right, subtract it from 9 and add the neighbour on its right.
Step III: At the last step, whentou are under the zero in front of the long number, subtract one from the neighbour and use that as the left-hand figure of the answer.
Ex 1 : 8576 X 9 = ?
Step I. Subtract the 6 of 8576 from 10, and we have 4 of the answer.
Step II. Subtract the 7 from 9 (we have 2) and add the neighbour 6; the result is 8.
Step III. (9-5)+7 = 11; put. 1 under the line and carry over 1.
Step IV. (9-8)+5+1 (carried ove) .= 7, put it down.
Step V (Last step). We are under the left-hand zero, so we reduce the left-hand figure of 8576 by one, and 7 is the left-hand figure of the answer
Thus answer is 77184.
We don't suggest you to give much emphasis on this rule. Because it is not very much easy to use. Some times it proves very lengthy also. See another method
Practice Question Solve the following:
(1) 34 X 9 = ? (2) 569 X 9 = ? 3) 1328 X 9 = ? 4) 56493 X 9 = ? (5) 89273258 X 9 = ?
Ans : (1) 306 (2) 5121 (3) 11952 (4) 508437 (5) 803459322
Step I : Put a zero at the right end of the number; ie, write 85760 for 8576.
Step II: Subtract the original number from that number. Like 85760 - 8576 = 77184
Share new methods & leave your comments below...
Click here to top