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As it ends with an 8, it is rounded up and becomes 80.
The figure ends with 14, so it will round down to the answer of 7800.
It ends in 1, so it gets rounded down to 5280.
85 is not a prime number as it is divisible by 5. Anything that ends with 5 is divisible by 5. The nearest prime number to 85 is 83 or 87.
It ends in a 9, so will round up, leaving 1.90 as the answer.