Let's get this math done. We have 784 and we're going to multiply it by 26. This is the same as taking 784 and adding it to itself 26 times.
Step 1: 0 + 784 = 784
Step 2: 784 + 784 = 1568
Step 3: 1568 + 784 = 2352
Step 4: 2352 + 784 = 3136
Step 5: 3136 + 784 = 3920
Step 6: 3920 + 784 = 4704
Step 7: 4704 + 784 = 5488
Step 8: 5488 + 784 = 6272
Step 9: 6272 + 784 = 7056
Step 10: 7056 + 784 = 7840
Step 11: 7840 + 784 = 8624
Step 12: 8624 + 784 = 9408
Step 13: 9408 + 784 = 10192
Step 14: 10192 + 784 = 10976
Step 15: 10976 + 784 = 11760
Step 16: 11760 + 784 = 12544
Step 17: 12544 + 784 = 13328
Step 18: 13328 + 784 = 14112
Step 19: 14112 + 784 = 14896
Step 20: 14896 + 784 = 15680
Step 21: 15680 + 784 = 16464
Step 22: 16464 + 784 = 17248
Step 23: 17248 + 784 = 18032
Step 24: 18032 + 784 = 18816
Step 25: 18816 + 784 = 19600
Step 26: 19600 + 784 = 20384

So, 784*26 = 20384