10.2B - Adding, Subtracting, Multiplying & Dividing Decimals

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What is the process of dividing decimals?

Back

To divide decimals, align the divisor (the number you are dividing by) to be a whole number by moving the decimal point to the right. Move the decimal point in the dividend (the number being divided) the same number of places. Then, perform the division as you would with whole numbers.

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How do you add decimals?

Back

To add decimals, align the numbers by their decimal points. Add zeros if necessary to make the numbers have the same number of decimal places. Then, add the numbers as you would with whole numbers, placing the decimal point in the sum directly below the aligned decimal points.

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What is the formula to find the cost per item when given total cost and quantity?

Back

The formula to find the cost per item is: Cost per item = Total cost / Quantity.

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How do you multiply decimals?

Back

To multiply decimals, multiply the numbers as if they were whole numbers. Count the total number of decimal places in both numbers. The product should have the same number of decimal places as the total counted.

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What is the process for subtracting decimals?

Back

To subtract decimals, align the numbers by their decimal points. Add zeros if necessary to make the numbers have the same number of decimal places. Then, subtract as you would with whole numbers, placing the decimal point in the difference directly below the aligned decimal points.

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How do you calculate the total cost of multiple items?

Back

To calculate the total cost of multiple items, multiply the cost of one item by the number of items purchased: Total cost = Cost per item x Quantity.

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What is the significance of rounding in decimal operations?

Back

Rounding is significant in decimal operations to simplify calculations and to express numbers in a more manageable form. It helps in estimating and can affect the accuracy of the final result.

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How do you convert a fraction to a decimal?

Back

To convert a fraction to a decimal, divide the numerator (top number) by the denominator (bottom number).

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What is the importance of understanding place value in decimal operations?

Back

Understanding place value is crucial in decimal operations as it helps in accurately adding, subtracting, multiplying, and dividing decimals, ensuring that the decimal point is correctly placed in the final answer.

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How do you find the average of a set of decimal numbers?

Back

To find the average, add all the decimal numbers together and then divide by the total number of values.