Alright, let's solve this math problem step by step. First, we have the number 504. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 140. So, we're going to take the number 504 and add it to itself 140 times.
Step 1: 0 + 504 = 504
Step 2: 504 + 504 = 1008
Step 3: 1008 + 504 = 1512
Step 4: 1512 + 504 = 2016
Step 5: 2016 + 504 = 2520
Step 6: 2520 + 504 = 3024
Step 7: 3024 + 504 = 3528
Step 8: 3528 + 504 = 4032
Step 9: 4032 + 504 = 4536
Step 10: 4536 + 504 = 5040
Step 11: 5040 + 504 = 5544
Step 12: 5544 + 504 = 6048
Step 13: 6048 + 504 = 6552
Step 14: 6552 + 504 = 7056
Step 15: 7056 + 504 = 7560
Step 16: 7560 + 504 = 8064
Step 17: 8064 + 504 = 8568
Step 18: 8568 + 504 = 9072
Step 19: 9072 + 504 = 9576
Step 20: 9576 + 504 = 10080
Step 21: 10080 + 504 = 10584
Step 22: 10584 + 504 = 11088
Step 23: 11088 + 504 = 11592
Step 24: 11592 + 504 = 12096
Step 25: 12096 + 504 = 12600
Step 26: 12600 + 504 = 13104
Step 27: 13104 + 504 = 13608
Step 28: 13608 + 504 = 14112
Step 29: 14112 + 504 = 14616
Step 30: 14616 + 504 = 15120
Step 31: 15120 + 504 = 15624
Step 32: 15624 + 504 = 16128
Step 33: 16128 + 504 = 16632
Step 34: 16632 + 504 = 17136
Step 35: 17136 + 504 = 17640
Step 36: 17640 + 504 = 18144
Step 37: 18144 + 504 = 18648
Step 38: 18648 + 504 = 19152
Step 39: 19152 + 504 = 19656
Step 40: 19656 + 504 = 20160
Step 41: 20160 + 504 = 20664
Step 42: 20664 + 504 = 21168
Step 43: 21168 + 504 = 21672
Step 44: 21672 + 504 = 22176
Step 45: 22176 + 504 = 22680
Step 46: 22680 + 504 = 23184
Step 47: 23184 + 504 = 23688
Step 48: 23688 + 504 = 24192
Step 49: 24192 + 504 = 24696
Step 50: 24696 + 504 = 25200
Step 51: 25200 + 504 = 25704
Step 52: 25704 + 504 = 26208
Step 53: 26208 + 504 = 26712
Step 54: 26712 + 504 = 27216
Step 55: 27216 + 504 = 27720
Step 56: 27720 + 504 = 28224
Step 57: 28224 + 504 = 28728
Step 58: 28728 + 504 = 29232
Step 59: 29232 + 504 = 29736
Step 60: 29736 + 504 = 30240
Step 61: 30240 + 504 = 30744
Step 62: 30744 + 504 = 31248
Step 63: 31248 + 504 = 31752
Step 64: 31752 + 504 = 32256
Step 65: 32256 + 504 = 32760
Step 66: 32760 + 504 = 33264
Step 67: 33264 + 504 = 33768
Step 68: 33768 + 504 = 34272
Step 69: 34272 + 504 = 34776
Step 70: 34776 + 504 = 35280
Step 71: 35280 + 504 = 35784
Step 72: 35784 + 504 = 36288
Step 73: 36288 + 504 = 36792
Step 74: 36792 + 504 = 37296
Step 75: 37296 + 504 = 37800
Step 76: 37800 + 504 = 38304
Step 77: 38304 + 504 = 38808
Step 78: 38808 + 504 = 39312
Step 79: 39312 + 504 = 39816
Step 80: 39816 + 504 = 40320
Step 81: 40320 + 504 = 40824
Step 82: 40824 + 504 = 41328
Step 83: 41328 + 504 = 41832
Step 84: 41832 + 504 = 42336
Step 85: 42336 + 504 = 42840
Step 86: 42840 + 504 = 43344
Step 87: 43344 + 504 = 43848
Step 88: 43848 + 504 = 44352
Step 89: 44352 + 504 = 44856
Step 90: 44856 + 504 = 45360
Step 91: 45360 + 504 = 45864
Step 92: 45864 + 504 = 46368
Step 93: 46368 + 504 = 46872
Step 94: 46872 + 504 = 47376
Step 95: 47376 + 504 = 47880
Step 96: 47880 + 504 = 48384
Step 97: 48384 + 504 = 48888
Step 98: 48888 + 504 = 49392
Step 99: 49392 + 504 = 49896
Step 100: 49896 + 504 = 50400
Step 101: 50400 + 504 = 50904
Step 102: 50904 + 504 = 51408
Step 103: 51408 + 504 = 51912
Step 104: 51912 + 504 = 52416
Step 105: 52416 + 504 = 52920
Step 106: 52920 + 504 = 53424
Step 107: 53424 + 504 = 53928
Step 108: 53928 + 504 = 54432
Step 109: 54432 + 504 = 54936
Step 110: 54936 + 504 = 55440
Step 111: 55440 + 504 = 55944
Step 112: 55944 + 504 = 56448
Step 113: 56448 + 504 = 56952
Step 114: 56952 + 504 = 57456
Step 115: 57456 + 504 = 57960
Step 116: 57960 + 504 = 58464
Step 117: 58464 + 504 = 58968
Step 118: 58968 + 504 = 59472
Step 119: 59472 + 504 = 59976
Step 120: 59976 + 504 = 60480
Step 121: 60480 + 504 = 60984
Step 122: 60984 + 504 = 61488
Step 123: 61488 + 504 = 61992
Step 124: 61992 + 504 = 62496
Step 125: 62496 + 504 = 63000
Step 126: 63000 + 504 = 63504
Step 127: 63504 + 504 = 64008
Step 128: 64008 + 504 = 64512
Step 129: 64512 + 504 = 65016
Step 130: 65016 + 504 = 65520
Step 131: 65520 + 504 = 66024
Step 132: 66024 + 504 = 66528
Step 133: 66528 + 504 = 67032
Step 134: 67032 + 504 = 67536
Step 135: 67536 + 504 = 68040
Step 136: 68040 + 504 = 68544
Step 137: 68544 + 504 = 69048
Step 138: 69048 + 504 = 69552
Step 139: 69552 + 504 = 70056
Step 140: 70056 + 504 = 70560

So, 504*140 = 70560