Mass and weight measurement math worksheets for primary students. Our mass worksheets are suited for primary 1 to primary 6 math students and are based on the Singapore math curriculum. Our mass and weight worksheets for math grades 1 to 6 cover: comparing mass worskheets, balancing scales worksheets, ordering weights worksheets, lighter and heavier worksheets, reading scales worksheets, drawing pointers worksheets, operations with units of mass worksheets ...