exam Maths Puzzle Numerical Ability

Estimate the following 4 1/2 + 7 9/10 + 2 1/7 + 5 7/8

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Simplify

Square root of 7/100

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Good day to all,I need some help with some problems,the first one is,Write 3cd^3 as a multiplication expression.The next one is,Simplify:f^3g^4 divided by f^4g^6.The next one is,Ex