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

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…

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.

Illustration showing a survey on the lake front in Chicago with distances and angle measures shown.

"An instrument much employed in land-surveying for the measurement of angles horizontal and verticle."…

For the builder or architect who wants to raise the standard of his work- who takes conspicuous pride…

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