Let's roll up our sleeves and solve this. We have 706 and we're going to multiply it by 31, essentially adding 706 to itself 31 times.
Step 1: 0 + 706 = 706
Step 2: 706 + 706 = 1412
Step 3: 1412 + 706 = 2118
Step 4: 2118 + 706 = 2824
Step 5: 2824 + 706 = 3530
Step 6: 3530 + 706 = 4236
Step 7: 4236 + 706 = 4942
Step 8: 4942 + 706 = 5648
Step 9: 5648 + 706 = 6354
Step 10: 6354 + 706 = 7060
Step 11: 7060 + 706 = 7766
Step 12: 7766 + 706 = 8472
Step 13: 8472 + 706 = 9178
Step 14: 9178 + 706 = 9884
Step 15: 9884 + 706 = 10590
Step 16: 10590 + 706 = 11296
Step 17: 11296 + 706 = 12002
Step 18: 12002 + 706 = 12708
Step 19: 12708 + 706 = 13414
Step 20: 13414 + 706 = 14120
Step 21: 14120 + 706 = 14826
Step 22: 14826 + 706 = 15532
Step 23: 15532 + 706 = 16238
Step 24: 16238 + 706 = 16944
Step 25: 16944 + 706 = 17650
Step 26: 17650 + 706 = 18356
Step 27: 18356 + 706 = 19062
Step 28: 19062 + 706 = 19768
Step 29: 19768 + 706 = 20474
Step 30: 20474 + 706 = 21180
Step 31: 21180 + 706 = 21886

So, 706*31 = 21886