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Q: How do you know whether you should add or subtract the value of the two numbers?

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explain why it is important to line up decimal numbers by their place value when you add or subtract them

add the three numbers the subtract 180 from your sum

Subtract the absolute value of the smaller number from the absolute value of the larger number. The answer will have the sign of the larger numbers.

It isn't really that important, it just makes the problem solving easier and gives you less of a chance of making a mistake.

This is true for adding and subtracting ALL numbers, not just decimal representations.

Fnd the lowest value and subtract it from the highest value.

The range is the distance from the smallest value to the largest value. This is equivalent to the largest value MINUS the smallest value. Therefore you subtract.

Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide mentally.So a logical compatible number for 77 would be 80.

Instead of "a half", write "eight sixteenths". That doesn't change the value of any numbers, but it makes it a lot easier to subtract the three sixteenths from the eight sixteenths.

Its value will be reduced as the numbers of moles of the materials is reduced

This difference is called the range. Subtract the smallest value (S) from the largest value (L).Formula: L - S = Difference

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