Sure thing! We've got 4 and we're gonna multiply it by 42. That's the same as adding 4 to itself 42 times.
Step 1: 0 + 4 = 4
Step 2: 4 + 4 = 8
Step 3: 8 + 4 = 12
Step 4: 12 + 4 = 16
Step 5: 16 + 4 = 20
Step 6: 20 + 4 = 24
Step 7: 24 + 4 = 28
Step 8: 28 + 4 = 32
Step 9: 32 + 4 = 36
Step 10: 36 + 4 = 40
Step 11: 40 + 4 = 44
Step 12: 44 + 4 = 48
Step 13: 48 + 4 = 52
Step 14: 52 + 4 = 56
Step 15: 56 + 4 = 60
Step 16: 60 + 4 = 64
Step 17: 64 + 4 = 68
Step 18: 68 + 4 = 72
Step 19: 72 + 4 = 76
Step 20: 76 + 4 = 80
Step 21: 80 + 4 = 84
Step 22: 84 + 4 = 88
Step 23: 88 + 4 = 92
Step 24: 92 + 4 = 96
Step 25: 96 + 4 = 100
Step 26: 100 + 4 = 104
Step 27: 104 + 4 = 108
Step 28: 108 + 4 = 112
Step 29: 112 + 4 = 116
Step 30: 116 + 4 = 120
Step 31: 120 + 4 = 124
Step 32: 124 + 4 = 128
Step 33: 128 + 4 = 132
Step 34: 132 + 4 = 136
Step 35: 136 + 4 = 140
Step 36: 140 + 4 = 144
Step 37: 144 + 4 = 148
Step 38: 148 + 4 = 152
Step 39: 152 + 4 = 156
Step 40: 156 + 4 = 160
Step 41: 160 + 4 = 164
Step 42: 164 + 4 = 168

So, 4*42 = 168