Compléter AbacusVersion en ligne Read and complete with the verbs in the past. par María Ortega 1 Many people use an abacus today to count but the Chinese ( to invent ) it a long time ago . They ( to start ) to use the abacus about 2 , 000 years ago because they ( to want ) something to help them count money . They ( to moved ) the beads from right to left and left to right . People in shops ( to use ) the abacus to do all the maths that we do today . They ( to add ) , ( to subtract ) , ( to divide ) and ( to multiply ) with an abacus .