exam Maths Puzzle Numerical Ability

My daughter started prealgebra yesterday and the answer to her question
10 x n = 8 Is n = 0.8 but how do I explain to her how i got it.

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exam Other Question

-77+ (-71)= Find the missing value.

Principle= $8200.00, Time= 2.5 years, Simple Interest=$3997.50, Rate=???

Please help

Ellen