Each shaded area in the grids below represents a decimal. This image shows two hundredths grid next to each other. The grid on left has forty four hundredths are shaded in yellow and remaining all the grids are empty. The grid on the right has eighty seven hundredths are shaded in blue and remaining all the grids are empty.

Which explains how to find the sum of the decimals?
A.

Count 40 shaded squares, or 0.40, on the first grid and 80 shaded squares, or 0.80, on the second grid. Then add them together to get 1.20.
B.

Count 44 shaded squares, or 0.44, on the first grid and 87 shaded squares, or 0.87, on the second grid. Then add them together to get 1.31.
C.

Count 56 shaded squares, or 0.56, on the first grid and 13 shaded squares, or 0.13, on the second grid. Then add them together to get 0.69.
D.

Count a total of 100 squares, or 1.00, on the left grid and 100 squares, or 1.00, on the right grid. Then add them together to get 2.00.