790
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To determine how many groups of ten are in the number 1230, we divide 1230 by 10. The result is 123, which means there are 123 groups of ten in 1230. Each group represents a multiple of 10 within the number 1230.
80
79 isn't a composite number because its only factors are 1 and itself.
79 - 27 = 52
It is: 79 minus 45 = 34