Alright, let's solve this math problem step by step. First, we have the number 12. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 70. So, we're going to take the number 12 and add it to itself 70 times.
Step 1: 0 + 12 = 12
Step 2: 12 + 12 = 24
Step 3: 24 + 12 = 36
Step 4: 36 + 12 = 48
Step 5: 48 + 12 = 60
Step 6: 60 + 12 = 72
Step 7: 72 + 12 = 84
Step 8: 84 + 12 = 96
Step 9: 96 + 12 = 108
Step 10: 108 + 12 = 120
Step 11: 120 + 12 = 132
Step 12: 132 + 12 = 144
Step 13: 144 + 12 = 156
Step 14: 156 + 12 = 168
Step 15: 168 + 12 = 180
Step 16: 180 + 12 = 192
Step 17: 192 + 12 = 204
Step 18: 204 + 12 = 216
Step 19: 216 + 12 = 228
Step 20: 228 + 12 = 240
Step 21: 240 + 12 = 252
Step 22: 252 + 12 = 264
Step 23: 264 + 12 = 276
Step 24: 276 + 12 = 288
Step 25: 288 + 12 = 300
Step 26: 300 + 12 = 312
Step 27: 312 + 12 = 324
Step 28: 324 + 12 = 336
Step 29: 336 + 12 = 348
Step 30: 348 + 12 = 360
Step 31: 360 + 12 = 372
Step 32: 372 + 12 = 384
Step 33: 384 + 12 = 396
Step 34: 396 + 12 = 408
Step 35: 408 + 12 = 420
Step 36: 420 + 12 = 432
Step 37: 432 + 12 = 444
Step 38: 444 + 12 = 456
Step 39: 456 + 12 = 468
Step 40: 468 + 12 = 480
Step 41: 480 + 12 = 492
Step 42: 492 + 12 = 504
Step 43: 504 + 12 = 516
Step 44: 516 + 12 = 528
Step 45: 528 + 12 = 540
Step 46: 540 + 12 = 552
Step 47: 552 + 12 = 564
Step 48: 564 + 12 = 576
Step 49: 576 + 12 = 588
Step 50: 588 + 12 = 600
Step 51: 600 + 12 = 612
Step 52: 612 + 12 = 624
Step 53: 624 + 12 = 636
Step 54: 636 + 12 = 648
Step 55: 648 + 12 = 660
Step 56: 660 + 12 = 672
Step 57: 672 + 12 = 684
Step 58: 684 + 12 = 696
Step 59: 696 + 12 = 708
Step 60: 708 + 12 = 720
Step 61: 720 + 12 = 732
Step 62: 732 + 12 = 744
Step 63: 744 + 12 = 756
Step 64: 756 + 12 = 768
Step 65: 768 + 12 = 780
Step 66: 780 + 12 = 792
Step 67: 792 + 12 = 804
Step 68: 804 + 12 = 816
Step 69: 816 + 12 = 828
Step 70: 828 + 12 = 840

So, 12*70 = 840