abaci abacist abacus arithmetic arithmetic-processes calculate calculating calculating-tool calculations count counting counting-frame counting-tray mathematics practical soroban visual-imagery add basic business buttons digit digital display math minus multiply number plus pocket subtract 1 2 3 blackboard blog board chalk chalkboard class learn list numbers one outline point points rules school teach teacher three to-do two accurate blueprint circle compass consult consultant consultation creative design device diameter dimensions draw engineer engineering figure geometry graphic illustrate illustration measure measurement pencil perfect perfection plan preparations prepare professional project radius shape tool trace work addition beginning child children clay color colour education elementary game grade homework introduction kid kids kindergarten lesson modelling numerals numerical order play play doh preschool primary schoolwork sequence student study subject subtraction toy