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Alice found 812-413=399 she added 812+399 to check her work. What did she do wrong?
399*1 = 399. So 399 is divisible by 399. 399*2 = 798. So 798 is divisible by 399. 399*3 =1197. So 1197 is divisible by 399. 399*4 = 1596. So 1596 is divisible by 399.
57/8 = 399/56 17/7 = 136/56 399 + 136 = 535/56 = 9 and 31/56
10.25% of 399= 10.25% * 399= 0.1025 * 399= 40.8975 (40.90)