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You are looking at an entry to do with Geometrical & mathematical instruments, but you might be interested in these topics from the Mathematics & arithmetic topic area:

• Addition, subtraction, multiplication & division
• Averages
• Branches & types of mathematics
• Calculations & calculating
• Fractions
• Geometrical shapes
• Geometry: bends, loops & curves
• Geometry: describing angles, lines & orientations
• Geometry: parts of geometrical shapes
• Geometry: properties of circles & curves
• Mathematical symbols
• Numbering & counting
• Numbers generally
• Numbers: cardinal, including nought & zero
• Numbers: groups of things according to number
• Numbers: ordinal
• Numbers: single, double & multiple
• Numerical relationships
• Statistics
• Tables, graphs & diagrams
• Terms for numbers