"From Figure 4 he sees a parallelogram equal to a rectangle of the same base and altitude. Cut out and paste in rectangle form." -Foster, 1921

Area of Parallelogram

"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 trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921

Area of Trapezoid

"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 trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921

Area of Trapezoid

"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 involving comparison, taller, shorter, highest, lowest, etc..

Three Bears and Chairs

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 problems involving comparison, taller, shorter, highest, lowest, counting, etc.

Children On A Bench

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.

Comparison Of Units Of Capacity

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 the cylinder.

Comparative Volumes Of A Cone And Cylinder

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.

Comparative Volumes Of A Cone, Sphere, And Cylinder

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.

Comparison Of Units Of Cubic Measure

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.

Comparative Surfaces Of A Cylinder And Sphere

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 addition, subtraction, and comparison.

Children Playing Darts

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 also shows liquid measures of quart and pint for comparison.

Dry Measures

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

Containers of liquid measure in comparison: one gallon, quart, pint, and gill.

Liquid Measures

Containers of liquid measure in comparison: one gallon, quart, pint, and gill.

Illustration of children holding number cards that can be used to write mathematics story problems involving addition, subtraction, and comparison.

Children Holding Number Cards

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 into the prism.

Comparative Volumes Of A Pyramid And Prism

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 comparison, measurement, etc.

Child Holding Rulers

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 comparison, taller, shorter, highest, lowest, etc.

Children Holding Rulers

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 comparison, taller, shorter, highest, lowest, etc.

Children Holding Rulers

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.

Comparison Of Units Of Square Measure

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.

Comparison Of Units Of Weight

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