Alright, let's solve this math problem step by step. First, we have the number 70. 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 70 and add it to itself 70 times.
Step 1: 0 + 70 = 70
Step 2: 70 + 70 = 140
Step 3: 140 + 70 = 210
Step 4: 210 + 70 = 280
Step 5: 280 + 70 = 350
Step 6: 350 + 70 = 420
Step 7: 420 + 70 = 490
Step 8: 490 + 70 = 560
Step 9: 560 + 70 = 630
Step 10: 630 + 70 = 700
Step 11: 700 + 70 = 770
Step 12: 770 + 70 = 840
Step 13: 840 + 70 = 910
Step 14: 910 + 70 = 980
Step 15: 980 + 70 = 1050
Step 16: 1050 + 70 = 1120
Step 17: 1120 + 70 = 1190
Step 18: 1190 + 70 = 1260
Step 19: 1260 + 70 = 1330
Step 20: 1330 + 70 = 1400
Step 21: 1400 + 70 = 1470
Step 22: 1470 + 70 = 1540
Step 23: 1540 + 70 = 1610
Step 24: 1610 + 70 = 1680
Step 25: 1680 + 70 = 1750
Step 26: 1750 + 70 = 1820
Step 27: 1820 + 70 = 1890
Step 28: 1890 + 70 = 1960
Step 29: 1960 + 70 = 2030
Step 30: 2030 + 70 = 2100
Step 31: 2100 + 70 = 2170
Step 32: 2170 + 70 = 2240
Step 33: 2240 + 70 = 2310
Step 34: 2310 + 70 = 2380
Step 35: 2380 + 70 = 2450
Step 36: 2450 + 70 = 2520
Step 37: 2520 + 70 = 2590
Step 38: 2590 + 70 = 2660
Step 39: 2660 + 70 = 2730
Step 40: 2730 + 70 = 2800
Step 41: 2800 + 70 = 2870
Step 42: 2870 + 70 = 2940
Step 43: 2940 + 70 = 3010
Step 44: 3010 + 70 = 3080
Step 45: 3080 + 70 = 3150
Step 46: 3150 + 70 = 3220
Step 47: 3220 + 70 = 3290
Step 48: 3290 + 70 = 3360
Step 49: 3360 + 70 = 3430
Step 50: 3430 + 70 = 3500
Step 51: 3500 + 70 = 3570
Step 52: 3570 + 70 = 3640
Step 53: 3640 + 70 = 3710
Step 54: 3710 + 70 = 3780
Step 55: 3780 + 70 = 3850
Step 56: 3850 + 70 = 3920
Step 57: 3920 + 70 = 3990
Step 58: 3990 + 70 = 4060
Step 59: 4060 + 70 = 4130
Step 60: 4130 + 70 = 4200
Step 61: 4200 + 70 = 4270
Step 62: 4270 + 70 = 4340
Step 63: 4340 + 70 = 4410
Step 64: 4410 + 70 = 4480
Step 65: 4480 + 70 = 4550
Step 66: 4550 + 70 = 4620
Step 67: 4620 + 70 = 4690
Step 68: 4690 + 70 = 4760
Step 69: 4760 + 70 = 4830
Step 70: 4830 + 70 = 4900

So, 70*70 = 4900