Amy and Michael work together to complete a puzzle. Amy completes 9/100 of the puzzle and Michael complete 3/10 of the puzzle. What fraction of the puzzle has been completed?
To add or subtract fractions, you need a common denominator. In this case, we can use 1000 as a common denominator since both 100 and 10 can be multiplied by 10 to get 1000.
Amy completed 9/100 of the puzzle, which is equivalent to 90/1000.
Michael completed 3/10 of the puzzle, which is equivalent to 300/1000.
To find the total fraction of the puzzle completed, we add the two fractions together:
90/1000 + 300/1000 = 390/1000
Therefore, the fraction of the puzzle that has been completed is 390/1000, or simplified, 39/100.