This when you are rounding off 43210 copy,56789 add 1
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Multiply the numbers, count the total number of decimal places in the problem and place that many in your product.
The number is already in decimal form so why would you want to estimate it in decimal form???
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.
200, as the actual answer is 190.