How many cubes are needed to make the solid below?

How many cubes are used to make the solid shape given below?

How many 7's are needed to get 161?

How many 6 are needed to get 30?

How many 6 are needed to get 30?

Three solid cubes of edges 3 units, 4 units and 5 units are melted to make another solid cube. The edge of the new cube is____

How many cubes are there in the diagram?

a line of shapes is constructed using matchsticks. i) find the rule that shows how many sticks are needed to make a group of such shapes? ii) how many matchsticks are needed to form a group of 12 shapes?