Word

電算

でんさん
electronic computation; computer
Word

珠算

玉算
しゅざん、たまざん
calculation with abacus
Word

積算

せきさん
addition; adding up; integration; estimate; quantity survey
Word

乗算

じょうざん
multiplication
Word

起算

きさん
reckoning from some position (e.g. point, date, etc.)
Word

減算

げんざん
subtraction
Word

誤算

ごさん
miscalculation
Word

除算

じょざん
division (arith)
Word

逆算

ぎゃくさん
counting backwards; calculating backwards; inverse operation; reverse operation
Word

算法

さんぽう
arithmetic; algorithm