YOU CAN estimate it by if your product has more than 5
The answer depends on what the decimal is: the processes for 9999.02 and 0.02 are very different.
This when you are rounding off 43210 copy,56789 add 1
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An estimate will give an indication of the order of magnitude of the answer. The decimal point determines the order of magnitude and so, if the two are in agreement, then the decimal point has been placed in the right place. However, if you did your arithmetic properly then there would be no need to do the extra calculations required for an estimate.
round down till there is not a decimal. example: 4.4*5.6 round to 4*5= about 20 (lower estimate)
One way is to multiply the numbers ignoring the decimal point. If the first multiplicand has d1 digits after the decimal point, and the second has d2 digits after the decimal point, then their product has (d1 + d2) digits after the decimal point.An alternative for the second stage is to estimate the answer to determine where the decimal point should go.
To find the number of decimal places in a product of decimal numbers, add up the total number of decimal places in each of the factors. For example, if you have 2.5 multiplied by 4.75, there are two decimal places in 2.5 and two decimal places in 4.75, so the product will have a total of four decimal places.
How would you describe a product to a new customer to Monsoon Accessorize
the product will have four decimal places
If the two decimal numbers have x and y digits after the decimal points, then the product has (x + y) digits after the decimal point.