Let's get this math done. We have 680 and we're going to multiply it by 47. This is the same as taking 680 and adding it to itself 47 times.
Step 1: 0 + 680 = 680
Step 2: 680 + 680 = 1360
Step 3: 1360 + 680 = 2040
Step 4: 2040 + 680 = 2720
Step 5: 2720 + 680 = 3400
Step 6: 3400 + 680 = 4080
Step 7: 4080 + 680 = 4760
Step 8: 4760 + 680 = 5440
Step 9: 5440 + 680 = 6120
Step 10: 6120 + 680 = 6800
Step 11: 6800 + 680 = 7480
Step 12: 7480 + 680 = 8160
Step 13: 8160 + 680 = 8840
Step 14: 8840 + 680 = 9520
Step 15: 9520 + 680 = 10200
Step 16: 10200 + 680 = 10880
Step 17: 10880 + 680 = 11560
Step 18: 11560 + 680 = 12240
Step 19: 12240 + 680 = 12920
Step 20: 12920 + 680 = 13600
Step 21: 13600 + 680 = 14280
Step 22: 14280 + 680 = 14960
Step 23: 14960 + 680 = 15640
Step 24: 15640 + 680 = 16320
Step 25: 16320 + 680 = 17000
Step 26: 17000 + 680 = 17680
Step 27: 17680 + 680 = 18360
Step 28: 18360 + 680 = 19040
Step 29: 19040 + 680 = 19720
Step 30: 19720 + 680 = 20400
Step 31: 20400 + 680 = 21080
Step 32: 21080 + 680 = 21760
Step 33: 21760 + 680 = 22440
Step 34: 22440 + 680 = 23120
Step 35: 23120 + 680 = 23800
Step 36: 23800 + 680 = 24480
Step 37: 24480 + 680 = 25160
Step 38: 25160 + 680 = 25840
Step 39: 25840 + 680 = 26520
Step 40: 26520 + 680 = 27200
Step 41: 27200 + 680 = 27880
Step 42: 27880 + 680 = 28560
Step 43: 28560 + 680 = 29240
Step 44: 29240 + 680 = 29920
Step 45: 29920 + 680 = 30600
Step 46: 30600 + 680 = 31280
Step 47: 31280 + 680 = 31960

So, 680*47 = 31960