-7
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When you round the 9 in the number 9.84 it will round up to the number 10.
15-------5 + 10 = 15 or10 + 5 = 15 (This is what we call commutative property of addition.)
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53/10
No - for a number to have an equivalent, there needs to be a second fraction for comparison - for example, an equivalent fraction for 7/10 is 14/20, because you have multiplied both the numerator and denominator by the same number.