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In order to keep the numbers in the proper place-value column when adding decimals, align the decimal points. This will keep the numbers aligned; ones to ones, tenths to tenths, hundredths to hundredths, and so on.
In order to keep the numbers in the proper place-value column when adding decimals, align the decimal points. This will keep the numbers aligned; ones to ones, tenths to tenths, hundredths to hundredths, and so on.
1) Line up the decimal points vertically. Fill in any 0’s where necessary. 2) Add or subtract the numbers as if they were whole numbers. 3) Place the decimal point in the sum or difference so that it lines up vertically with the numbers being added or subtracted.
Simply line up the decimal points and then add or subtract just as you would with whole numbers. The decimal point drops straight down in your answer.
When asked to add or subtract decimals, the most important step is to line up the decimal points. Step 1: Line up the decimal points so that similar place values are lined up. In other words, the tens place in both numbers should be lined up, the ones place in both numbers should be lined up, etc.
When the divisor is a decimal, what must we do? | |
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1) | Multiply the divisor by 10, or 100, or 1000, etc., according to the number of decimal digits, so that it becomes a whole number. |
2) | Multiply the dividend by the same power of 10. |
To add decimals, write the numbers in a column, and make sure that the decimal points are aligned. To keep the decimal point in your sum, place a decimal point directly below the decimal points in the addends. Align the decimal point in the sum with decimal point in the addends, add a zero if necessary.
Step 1: Line up the numbers vertically so that the decimal points all lie on a vertical line. Step 2: Add extra zeros to the right of the number so that each number has the same number of digits to the right of the decimal place. Step 3: Subtract the numbers as you would whole numbers.
Addition and subtraction with decimals are just the same as addition and subtraction with the whole number. The most important thing to remember is to line up the decimal points so that when you stack them, they are directly on top of each other.
Remember that when you divide, you do not count the total number of decimal places in the divisor and dividend. You change the divisor to a whole number, then move the decimal point in the dividend the same number of places and divide.
Example: 15 divided by 0.2
The number we divide by is called the divisor. To divide decimal numbers: Multiply the divisor by as many 10’s as we need, until it is a whole number. Remember to multiply the dividend by the same number of 10’s.
First, move the divisor’s decimal point to the right as many places as necessary to place it after the last digit and make it a whole number. Then, move the dividend’s decimal point the same number of places to the right. We can add a decimal point and zeroes after a whole number if necessary.
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