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25*84
25 + 25 = 50 (= 25 × 2)
50 + 50 = 100 (= 25 × 4)
100 + 100 = 200 (= 25 × 8)
200 + 200 = 400 (= 25 × 16)
400 + 400 = 800 (= 25 × 32)
800 + 800 = 1600 (= 25 × 64)
4..... 100
16.... 400
64.... 1600
__________
84 .... 2100