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How does estimation help you to place the decimal point when multiplying?
You will multiply just as if you were multiplying whole numbers. Because the original numbers have 7 digits total after their decimal points, insert a decimal point into your answer so that it has 7 digits to its right. Next, estimate the answer by multiplying the leading digits.
How can you use estimation to help you place the decimal point in a product?
Estimating When Multiplying Decimals You can multiply a decimal with a whole number to find an exact answer. When an exact answer is not necessary, you can find an approximate product by estimating. To find a reasonable estimate using decimal numbers, round the decimal to the nearest whole number.
How do you estimate multiplying decimals?
To multiply decimals, first multiply as if there is no decimal. Next, count the number of digits after the decimal in each factor. Finally, put the same number of digits behind the decimal in the product.
How do you determine where to place the decimal point in the product of decimal multiplication problems?
Rule for multiplying decimals A common way to multiply decimals is to treat them as whole numbers, and then position the decimal point in the product. The number of digits after the decimal points in the factors determines where the decimal point is placed in the answer. For example, 0.3 x 0.8 = 0.24.
How can you check the answer to a decimal problem?
To check the answer to a decimal multiplication problem, you can divide the product with one of the decimal numbers. If the answer is equal to the other number, then your answer is correct.
How do you estimate decimals products and quotients?
To estimate products and quotients with decimals, you need to first round the numbers so that they are easier to work with. To round to the nearest whole number, look at the digit in the tenths place. If it is less than 5, round down. If it is 5 or greater, round up.
How do we determine the number of decimal places in the product?
Multiply decimal numbers. Write the numbers in vertical format, lining up the numbers on the right. Multiply the numbers as if they were whole numbers, temporarily ignoring the decimal points. Place the decimal point. The number of decimal places in the product is the sum of the number of decimal places in the factors.
How do you know how many decimal places to use?
For the number of decimal places stated, count that number of digits to the right of the decimal and underline it. The next number to its right is called the ’rounder decider’. If the ’rounder decider’ is 5 or more, then round the previous digit up by 1.