That's a simple question.
Ans: If both numbers can be divided to equal a whole number, then it can be simplified.
Example: 35:7 (this is your ratio) divided by 7 = 5:1
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He can round 0.85 up, because its over .50.
He can round 15.92 up, because it is also over .50.
16 + 1 = 17 is the estimate.
