In this app the questions are carefully graded from easy up to difficult in easy steps.
ConceptArea concept by counting squaresPerimeter
AreaTriangle area as half a rectangle areaTriangle area as half base x heightParallelogram areaTrapezium areaCompound areas
CirclesPi and circumferenceCircle areaArea of sector
VolumeVolume concept by counting cubesPrism and cylinder volumeVolume units
A tutor screen
The worked example