MATHEMATICS

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abacus

algebra or algebraic

block building

bases or base or quinary system or binary system or quaternary system or ternary system

counting

fractions

geometry or geometric

(mathematics or mathematical or arith*) and (preschool or early childhood or elementary)

(mathematics or mathematical or arith*) and (secondary or high school or middle school or junior high)

measurement or mensuration or volume or length

money or coins

number

problem solving and mathematics

shape* or circle or square or triangle* or rectangle* or trapezoid* or hexagon* or pentagon” or octagon”

symmetry

time or clock* or calendar*