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I put the image in to a 10x10 grid.

I first labelled the triangles A B C on squared paper and then counted all the squares in the smallest triangle (excluding the halves which you use two to make one)which was 12.5.

Then I made it into a fraction which was 12.5 over 100 because it was a ten by ten square.

After that I saw that the smallest triangle was half of a quarter, so it was an eighth.

I saw if I flipped a triangle of the two larger ones, it would take up half of the square. So A had to be half of a half...therefore a quarter.

Then we drew an eight square block and wrote two A twice and one c and the rest were B so B was three eighths. So B was three eighths