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1/10 + 2/7 = 7/70 + 20/70 = 27/70
70. When you divide fractions [(10/1) and (1/7)], you flip the second term and then multiply them out. So 10 ÷ 1/7 would equal 10 * 7/1, which is just 10 * 7 or 70. =]
1 and 1 seventh. 1 is a whole number, so we can just leave it, but 1 seventh is not. So we just add the two together, which equals 1 and 1 seventh
One seventh of 35 is 5.
The reciprocal of one seventh or 1/7 is 7.