Sure thing! We've got 824 and we're gonna multiply it by 85. That's the same as adding 824 to itself 85 times.
Step 1: 0 + 824 = 824
Step 2: 824 + 824 = 1648
Step 3: 1648 + 824 = 2472
Step 4: 2472 + 824 = 3296
Step 5: 3296 + 824 = 4120
Step 6: 4120 + 824 = 4944
Step 7: 4944 + 824 = 5768
Step 8: 5768 + 824 = 6592
Step 9: 6592 + 824 = 7416
Step 10: 7416 + 824 = 8240
Step 11: 8240 + 824 = 9064
Step 12: 9064 + 824 = 9888
Step 13: 9888 + 824 = 10712
Step 14: 10712 + 824 = 11536
Step 15: 11536 + 824 = 12360
Step 16: 12360 + 824 = 13184
Step 17: 13184 + 824 = 14008
Step 18: 14008 + 824 = 14832
Step 19: 14832 + 824 = 15656
Step 20: 15656 + 824 = 16480
Step 21: 16480 + 824 = 17304
Step 22: 17304 + 824 = 18128
Step 23: 18128 + 824 = 18952
Step 24: 18952 + 824 = 19776
Step 25: 19776 + 824 = 20600
Step 26: 20600 + 824 = 21424
Step 27: 21424 + 824 = 22248
Step 28: 22248 + 824 = 23072
Step 29: 23072 + 824 = 23896
Step 30: 23896 + 824 = 24720
Step 31: 24720 + 824 = 25544
Step 32: 25544 + 824 = 26368
Step 33: 26368 + 824 = 27192
Step 34: 27192 + 824 = 28016
Step 35: 28016 + 824 = 28840
Step 36: 28840 + 824 = 29664
Step 37: 29664 + 824 = 30488
Step 38: 30488 + 824 = 31312
Step 39: 31312 + 824 = 32136
Step 40: 32136 + 824 = 32960
Step 41: 32960 + 824 = 33784
Step 42: 33784 + 824 = 34608
Step 43: 34608 + 824 = 35432
Step 44: 35432 + 824 = 36256
Step 45: 36256 + 824 = 37080
Step 46: 37080 + 824 = 37904
Step 47: 37904 + 824 = 38728
Step 48: 38728 + 824 = 39552
Step 49: 39552 + 824 = 40376
Step 50: 40376 + 824 = 41200
Step 51: 41200 + 824 = 42024
Step 52: 42024 + 824 = 42848
Step 53: 42848 + 824 = 43672
Step 54: 43672 + 824 = 44496
Step 55: 44496 + 824 = 45320
Step 56: 45320 + 824 = 46144
Step 57: 46144 + 824 = 46968
Step 58: 46968 + 824 = 47792
Step 59: 47792 + 824 = 48616
Step 60: 48616 + 824 = 49440
Step 61: 49440 + 824 = 50264
Step 62: 50264 + 824 = 51088
Step 63: 51088 + 824 = 51912
Step 64: 51912 + 824 = 52736
Step 65: 52736 + 824 = 53560
Step 66: 53560 + 824 = 54384
Step 67: 54384 + 824 = 55208
Step 68: 55208 + 824 = 56032
Step 69: 56032 + 824 = 56856
Step 70: 56856 + 824 = 57680
Step 71: 57680 + 824 = 58504
Step 72: 58504 + 824 = 59328
Step 73: 59328 + 824 = 60152
Step 74: 60152 + 824 = 60976
Step 75: 60976 + 824 = 61800
Step 76: 61800 + 824 = 62624
Step 77: 62624 + 824 = 63448
Step 78: 63448 + 824 = 64272
Step 79: 64272 + 824 = 65096
Step 80: 65096 + 824 = 65920
Step 81: 65920 + 824 = 66744
Step 82: 66744 + 824 = 67568
Step 83: 67568 + 824 = 68392
Step 84: 68392 + 824 = 69216
Step 85: 69216 + 824 = 70040

So, 824*85 = 70040