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For 563 Carol should've said leave it with me. If you multiply the hundred by the 6 and factor down by 7 you get 558 with a 5 remaining, so 100-7 = 93 93 * (5+(10/10)) = 558 558+5 = 563
Remembering that 75 by 12 is 900, 75 by 13 is 975 and 75 by (25/2); or twelve and a half essentially; is quite close to the target at 937.5 (six and a half below), this one's actually not too difficult. 75*25 = 1875 1875 + 5 = 1880 1880 / 2 = 940 940 + 4 = 944