MULTIPLICATION OF A NUMBER BY 13, 14, 15, 16, 17, 18 OR 19
Just similar to 12, to multiply a number by 13, multiply the left side digit by 3 and add to the right side digit.
Similarly, for 14 multiply by 4, for 15 by 5, for 16 by 6, for 17 by 7, for 18 by 8 and for 19 multiply by 9.
For example.
27483 x 18
0274830
3×8+0 (2)4
8 x 8 + 3(+2) (6)94
4 x 8 + 3(+6) (4)694
7 x 8 + 4(+4) (6)4694
2 x 8 + 7(+6) (2)94694
0 x 8 + 2(+2) 494694
27483 x 18 = 494694
You try these
- 38759 x 13
- 729463 x 19
- 582753 x 16
- 253874 x 18
- 3962183 x 14
- 650466 x 17
- 693498573 x 12
- 7453956748 x 11
- 6139848 x 15
- 59825303 x 19