How i solve a fraction problem by RICO

This is the problem that I solved. it was about Nash and Sia making fifteen lava lava. I knew that each lava uses 2/3 of a metre of material.

2/3 is 1 metre of material so we need to multiply 2/3 of a metre of material by 15 lava lava's=30/3 then I went 30 divided by 3=10
so it's ten whole metre's

First I did 2/3 then I doubled that which would equal 4/3 of a metre.This makes 2 lava lavas. Second it was hard to figure this out because it has 2/3 of a metre which would have some left overs out of the metre .Thirdly I doubled it by 2 so I can get closer to fifteen there would be one whole and one half and four lava lava. Then I doubled it by 10 and there was 12 lava lava I doubled it by 2 again so i can get closer to my answer which i got it . I worked out that 2/3 +2/3= 4/3 2/3+2/3=4/3=8/3 altogether I knew it was 8/3 because when you put two fraction's together you don't double the denominator only the numerator.

2/3+2/3=4/3 2/3+2/3 =4/3=8/3 I worked out that altogether it would be 1 whole and 6/3 of a metre so i know this because you can't have sixteen as the numerator so it's one whole and six thirds. They need a extra metre of fabric cause the one whole takes up
the whole metre.So then there is five thirds of fabric left the answer is one whole and six thirds that is the answer the left over is two thirds of the metre left.

this problem was a little bit hard but i still manged to complete it.I got the 2/3 from the problem.
the metre was very useful to use in my head.I used a imaginary metre ruler in my head.The answer for the left overs are 2/3 so they can make one more lava lava.    

my next steps are to improve in my math's