Classroom set of desk top number lines with 15pcs -10 to 10, 15pcs of -20 to 0, and 15pcs of 1 to 20. All sets have blank calibration on reverse side. Write-on, wipe-off plastic, 305 x 55mm.
10+
Learn basic number concepts
Ideal for children to learn negative numbers, counting, operations, addition and subtraction.
Develop number sense
Helps children in visualizing numerical order to develop number sense, and to become proficient in negative numbers, multiple and pattern.
Essential educational tool
Valuable and essential educational tool for all schools and home activities.
Edx Education 
Edx Education Number Line (Fractions) 
edx education_19612_Pattern Play Activity Set-0