Multiplying any number by 11 is a simple two-step process:
1 + 3 = 4
13 × 11 = 1[1+3]3 = 143 = 143
With this quick trick, multiplying any number by 11 becomes effortless!
12×11 = 1[1+2]2 = 1[3]2 = 132
15×11 = 1[1+5]5 = 1[6]5 = 165
32×11 = 3[3+2]2 = 3[5]2 = 352
27×11 = 2[2+7]7 = 2[9]7 = 297
81×11 = 8[8+1]1 = 8[9]1 = 891
38×11 = 3[3+8]8 = 3[11]8 = 4[1]8 = 418
67×11 = 6[6+7]7 = 6[13]7 = 7[3]7 = 737