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-21
8
13/8 = 13 ÷ 8 = 1.625
8/13 = 0.6153846154......
8 - 13 = -5.
0.6154
8 goes into 13 once with a remainder of 5.
8 plus 5 equals 13
13/8 = 1.625
lesson 8 13
21 - 8 = 13
13 + 8 = 21.