A protractor indicating a measurement of 165 degrees.

Protractor, 165 Degrees

A protractor indicating a measurement of 165 degrees.

A protractor indicating a measurement of 165 degrees from the right side.

Protractor, 165 Degrees

A protractor indicating a measurement of 165 degrees from the right side.

A protractor indicating a measurement of 170 degrees.

Protractor, 170 Degrees

A protractor indicating a measurement of 170 degrees.

A protractor indicating a measurement of 170 degrees from the right side.

Protractor, 170 Degrees

A protractor indicating a measurement of 170 degrees from the right side.

A protractor indicating a measurement of 175 degrees.

Protractor, 175 Degrees

A protractor indicating a measurement of 175 degrees.

A protractor indicating a measurement of 20 degrees.

Protractor, 20 Degrees

A protractor indicating a measurement of 20 degrees.

A protractor indicating a measurement of 20 degrees from the right side.

Protractor, 20 Degrees

A protractor indicating a measurement of 20 degrees from the right side.

A protractor indicating a measurement of 25 degrees.

Protractor, 25 Degrees

A protractor indicating a measurement of 25 degrees.

A protractor indicating a measurement of 25 degrees from the right side.

Protractor, 25 Degrees

A protractor indicating a measurement of 25 degrees from the right side.

A protractor with 30 and 150 degree suplementary angles indicated.

Protractor, 30 and 150 Degrees

A protractor with 30 and 150 degree suplementary angles indicated.

A protractor indicating a measurement of 30 degrees.

Protractor, 30 Degrees

A protractor indicating a measurement of 30 degrees.

A protractor indicating a measurement of 30 degrees from the right side.

Protractor, 30 Degrees

A protractor indicating a measurement of 30 degrees from the right side.

A protractor indicating a measurement of 35 degrees.

Protractor, 35 Degrees

A protractor indicating a measurement of 35 degrees.

A protractor indicating a measurement of 35 degrees from the right side.

Protractor, 35 Degrees

A protractor indicating a measurement of 35 degrees from the right side.

A protractor indicating a measurement of 40 degrees.

Protractor, 40 Degrees

A protractor indicating a measurement of 40 degrees.

A protractor indicating a measurement of 40 degrees from the right side.

Protractor, 40 Degrees

A protractor indicating a measurement of 40 degrees from the right side.

A protractor with 45 and 135 degree suplementary angles indicated.

Protractor, 45 and 135 Degrees

A protractor with 45 and 135 degree suplementary angles indicated.

A protractor indicating a measurement of 45 degrees.

Protractor, 45 Degrees

A protractor indicating a measurement of 45 degrees.

A protractor indicating a measurement of 45 degrees from the right side.

Protractor, 45 Degrees

A protractor indicating a measurement of 45 degrees from the right side.

A protractor indicating a measurement of 50 degrees.

Protractor, 50 Degrees

A protractor indicating a measurement of 50 degrees.

A protractor indicating a measurement of 50 degrees from the right side.

Protractor, 50 Degrees

A protractor indicating a measurement of 50 degrees from the right side.

A protractor indicating a measurement of 55 degrees.

Protractor, 55 Degrees

A protractor indicating a measurement of 55 degrees.

A protractor indicating a measurement of 55 degrees from the right side.

Protractor, 55 Degrees

A protractor indicating a measurement of 55 degrees from the right side.

A protractor with 60 and 120 degree suplementary angles indicated.

Protractor, 60 and 120 Degrees

A protractor with 60 and 120 degree suplementary angles indicated.

A protractor indicating a measurement of 60 degrees.

Protractor, 60 Degrees

A protractor indicating a measurement of 60 degrees.

A protractor indicating a measurement of 60 degrees from the right side.

Protractor, 60 Degrees

A protractor indicating a measurement of 60 degrees from the right side.

A protractor indicating a measurement of 65 degrees.

Protractor, 65 Degrees

A protractor indicating a measurement of 65 degrees.

A protractor indicating a measurement of 65 degrees from the right side.

Protractor, 65 Degrees

A protractor indicating a measurement of 65 degrees from the right side.

A protractor indicating a measurement of 70 degrees.

Protractor, 70 Degrees

A protractor indicating a measurement of 70 degrees.

A protractor indicating a measurement of 70 degrees from the right side.

Protractor, 70 Degrees

A protractor indicating a measurement of 70 degrees from the right side.

A protractor indicating a measurement of 75 degrees.

Protractor, 75 Degrees

A protractor indicating a measurement of 75 degrees.

A protractor indicating a measurement of 75 degrees from the right side.

Protractor, 75 Degrees

A protractor indicating a measurement of 75 degrees from the right side.

A protractor indicating a measurement of 80 degrees.

Protractor, 80 Degrees

A protractor indicating a measurement of 80 degrees.

A protractor indicating a measurement of 80 degrees from the right side.

Protractor, 80 Degrees

A protractor indicating a measurement of 80 degrees from the right side.

A protractor indicating a measurement of 85 degrees.

Protractor, 85 Degrees

A protractor indicating a measurement of 85 degrees.

A protractor indicating a measurement of 85 degrees from the right side.

Protractor, 85 Degrees

A protractor indicating a measurement of 85 degrees from the right side.

A protractor with 90 and 90 degree suplementary angles indicated.

Protractor, 90 and 90 Degrees

A protractor with 90 and 90 degree suplementary angles indicated.

A protractor indicating a measurement of 90 degrees.

Protractor, 90 Degrees

A protractor indicating a measurement of 90 degrees.

A protractor indicating a measurement of 90 degrees from the right side.

Protractor, 90 Degrees

A protractor indicating a measurement of 90 degrees from the right side.

A protractor indicating a measurement of 95 degrees.

Protractor, 95 Degrees

A protractor indicating a measurement of 95 degrees.

A protractor indicating a measurement of 95 degrees from the right side.

Protractor, 95 Degrees

A protractor indicating a measurement of 95 degrees from the right side.

Illustration that uses triangles to measure the distance across a river.

Using Triangles To Measure A River

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a river.

Using Triangles To Measure A River

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a river.

Using Triangles To Measure A River

Illustration that uses triangles to measure the distance across a river.

An instrument with straight edges or sides, for drawing lines; a rule.

Ruler

An instrument with straight edges or sides, for drawing lines; a rule.

English ruler with half inch markings.

Half Inch Ruler

English ruler with half inch markings.

English ruler with inch markings.

Inches Ruler

English ruler with inch markings.

Metric ruler.

Metric Ruler

Metric ruler.

English ruler with quarter inch markings.

Quarter Inch Ruler

English ruler with quarter inch markings.

Six inch ruler with half inch markings.

Six Inch Ruler

Six inch ruler with half inch markings.

Six inch ruler with quarter inch markings.

Six Inch Ruler

Six inch ruler with quarter inch markings.

Six inch ruler with inch markings.

Six Inch Ruler

Six inch ruler with inch markings.

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…

Scales found at Pompeii

Scales

Scales found at Pompeii

Scales used for coining.

Scales

Scales used for coining.

Five students are learning how to use scales to measure a book. They have balanced the book with some weights.

Children Using Scales

Five students are learning how to use scales to measure a book. They have balanced the book with some…

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 of steel square.

Steel Square

Illustration of steel square.