What is the sum of 3/10 and 68/100

Convert 3/10 to a fraction over 100. We do this by multiply 10 to the numerator and denominator.



Now we can add the numerators of the two fractions together and keep the denominator.





Simplify by dividing 2 to the numerator and denominator:

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm