You align their decimal points. Sum the numbers as normal and, in the answer, place the decimal point so that it lines up with those of the summands.
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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.
its 7.38 not 738
They are 1.5 and 2.4
20
1000110. In decimal, the sum is 23+47=70.