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

Write the equation of the line that passes through point (5,-8) with a slope of -2. Shandra combined the following juices to make fruit punch: 800ml applt juice, 500ml pineapple juice, 1,000ml of orange juice and 200ml of grape juice. What was the total amount of fruit punch made in liters?