Some of the words he invented evolved: 'aftrekken' (subtract) and 'delen' (divide) stayed the same, but over time 'menigvuldigen' became 'vermenigvuldigen' (multiply, the added 'ver' emphasizes the fact it is an action). 'Vergaderen' (gathering) became 'optellen' (add lit. count up).
Some, of the words he invented evolved: 'aftrekken' (subtract,) and 'delen' (divide) stayed the same but over time 'menigvuldigen' became 'vermenigvuldigen' (multiply the added 'ver' emphasizes the fact it is an action). 'Vergaderen' (gathering) became 'optellen' (add lit. count up).