Roller Chart Small 320×128 Medium 640×255 Large 1024×409 Download Tiff Original 2400×958 | (255.6 KB) Description This set of numbers is used by a teacher to help the students practice adding numbers in columns. After they have mastered two numbers, the chart can be pulled down to show columns of three numbers to add and so on. Keywords add, adding numbers, addition, drill practice, math drill, math problems, mathematics, number columns, roller chart Galleries Miscellaneous Math Tools Source: Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
