"From Figure 4 he sees a parallelogram equal to a rectangle of the same base and altitude. Cut out and…

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

"The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the…

Illustration of the three bears with three chairs that can be used to write mathematics story problems…

Illustration of children sitting on a bench and standing that can be used to write mathematics story…

Illustration comparing the fundamental units of measure quart and liter.

Illustration used to compare the volumes of a cone and a cylinder by emptying sand from the cone into…

Illustration used to compare the volumes of a cone, a sphere, and a cylinder.

Illustration comparing the fundamental units of measure 1 cubic yard and 1 cubic meter.

Illustration used to compare the surfaces of a cylinder and a sphere.

Illustration of children playing darts that can be used to write mathematics story problems involving…

Containers of dry measure in comparison: one bushel, peck, one half bushel, and one half peck. Illustration…

Illustration of children holding number cards that can be used to write mathematics story problems involving…

Illustration used to compare the volumes of a pyramid and a prism by emptying sand from the pyramid…

Illustration of a child measuring with rulers that can be used to write mathematics story problems involving…

Illustration of two children holding rulers that can be used to write mathematics story problems involving…

Illustration of children holding rulers that can be used to write mathematics story problems involving…

Illustration comparing the fundamental units of measure 1 square yard and 1 square meter.

Illustration comparing the fundamental units of measure ounces to grams and pounds to kilograms.