Without delay, let's solve this. We've got 145 and we will be multiplying it by 40, that is, adding 145 to itself 40 times.
Step 1: 0 + 145 = 145
Step 2: 145 + 145 = 290
Step 3: 290 + 145 = 435
Step 4: 435 + 145 = 580
Step 5: 580 + 145 = 725
Step 6: 725 + 145 = 870
Step 7: 870 + 145 = 1015
Step 8: 1015 + 145 = 1160
Step 9: 1160 + 145 = 1305
Step 10: 1305 + 145 = 1450
Step 11: 1450 + 145 = 1595
Step 12: 1595 + 145 = 1740
Step 13: 1740 + 145 = 1885
Step 14: 1885 + 145 = 2030
Step 15: 2030 + 145 = 2175
Step 16: 2175 + 145 = 2320
Step 17: 2320 + 145 = 2465
Step 18: 2465 + 145 = 2610
Step 19: 2610 + 145 = 2755
Step 20: 2755 + 145 = 2900
Step 21: 2900 + 145 = 3045
Step 22: 3045 + 145 = 3190
Step 23: 3190 + 145 = 3335
Step 24: 3335 + 145 = 3480
Step 25: 3480 + 145 = 3625
Step 26: 3625 + 145 = 3770
Step 27: 3770 + 145 = 3915
Step 28: 3915 + 145 = 4060
Step 29: 4060 + 145 = 4205
Step 30: 4205 + 145 = 4350
Step 31: 4350 + 145 = 4495
Step 32: 4495 + 145 = 4640
Step 33: 4640 + 145 = 4785
Step 34: 4785 + 145 = 4930
Step 35: 4930 + 145 = 5075
Step 36: 5075 + 145 = 5220
Step 37: 5220 + 145 = 5365
Step 38: 5365 + 145 = 5510
Step 39: 5510 + 145 = 5655
Step 40: 5655 + 145 = 5800

So, 145*40 = 5800