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Earn +20 ptsQ: Why do you estimate when adding or subtracting decimal numbers?
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When subtracting or adding numbers in scientific notation why do the exponents need to be the same?
This is effectively the same as lining up the decimal points when adding or subtracting ordinary decimal fractions.
When do you need to write zero as a placeholder when adding and subtracting decimals?
Adding decimal same as adding whole numbers
When adding or subtracting decimals the decimal point must be in line for all numbers?
Yes.
Why it is important to line up decimal numbers by their play value when you add or subtract them?
This is true for adding and subtracting ALL numbers, not just decimal representations.
What happens to the decimal in adding and subtracting decimals?
When you are adding and subtracting decimals, youare +/- ing the whole numbers and tenths in the number. the decimal might go away ex: 1.3-0.3=1 or it won't ex: 1.9-0.3=1.6
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