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What are the fractional units of two and six sevenths? How many such units are there? How many more such units must be added to make it the smallest composite number?
The decimal unit of 2 and 7/6 is 1/7, and there are 20 such units. The sum of eight such units is the smallest sum.

1, decimal unit: divide the unit "1" into several equal parts, which is called decimal unit. That is, the numerator is 1, and the denominator is a positive integer fraction, also called unit fraction, which is recorded as1/n.

Two sevenths = two sevenths.

2. Composite number: a mathematical term that refers to a natural number that can be divisible by other numbers except 1 and itself.

Therefore, the minimum composite number is 4.

Twenty-eight sevenths = four