
Arundeep
 
MULTIPLICATION BY 13 : To multiply any number by 13, we"Treble each digit in turn and add its right neighbour". This is the same as multiplying by 12 except that now we "treble" the "number" before we add its "neighbour". If we want to multiply 9483 by 13, we proceed like this :
The answer is 1,23,279. Practice Question Solve the following: (1)35609 X 13 (2)11123009 X 13 (3)456789 X 13 (4)22200007 X 13 Ans : (1) 462917 (2) 144599117 (3) 5938257 (4) 288600091  