EduportalBD.com*. Take 15 x 13 for an example.
*. Always place the larger number of the two on top in your mind.
*. Then draw the shape of Africa mentally so it covers the 15 and the 3 from the 13 below. Those covered numbers are all youneed.
*. First add 15 + 3 = 18
*. Add a zero behind it (multiply by 10) to get 180.
*. Multiply the covered lower 3 x the single digit above it the “5” (3×5= 15)
*. Add 180 + 15 = 195.Thank You