Explain how you know the number of decimal places that should be in the product when you multiply two decimal numbers together

Say if i had 21.1 x22.2 and if you lined it up you would put your decimal straight dow say if you had 1.1 x4.67 you whould put the 4.67 at the top then you would put the one under the 4 then put you decimal down take the other 1 and put ot under the 6 be hind the second one you put a zero but you dont't have to i hoped this help you and also you can look how many decimals are an start at the tight and move 123456789 decimal spaces

To solve it, convert 49% into a decimal, which would be 0.49 (you convert it to a decimal by moving the decimal twice to the left). Then, you multiply 0.49 to 15 which gives you the answer, 7.35.

If you wanted to make an equation like your question asks, you can set up a proportion and cross multiply. Since the question is asking for a part out of a whole (the whole is 15), your first fraction would be x/15. Then, for your next proportion, you would convert 49% to a fraction out of 100 which would be 49/100. Then, you would set the two fractions equal to one another so that the proportion looks like this: x/15=49/100
Then, you cross multiply (100*x=15*49) and you get 100x=735.
Finally, you solve for x and you get x= 7.35