The yellow hexagon is one whole, a red trapezoid is a half, a blue rhombus a third and a green triangle a sixth. Most questions ask the student to cover a fraction such as 2/3 by adding blocks; others show blocks already in place and ask which fraction is covered.
Some targets are more than one whole, like 4/3 or 5/3, and spill onto a second hexagon. Some questions allow only one kind of block, so 2/3 has to be seen as two thirds rather than four sixths.
Numbers&Me is free. Sign up to practise more, or set it as homework in under a minute, and it marks itself.