book Maths Puzzle Numerical Ability

When your estimating by clustering how do you know to keep it the same or round it up? For example 8.7+3.21+3.889?

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book Other Question

simplify & solve

6x(-5y)+(-3x)(-4y)


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I need a little help!!

How can I solve square root of 2 + square root of 3 - square root of 5 divided by square root of 2 + square root of 3 + square root of 5.

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