'n Rationaal getal es 't quotiënt (veroedinge, in 't Latyn: ratio) van twêe gehêle getalln.
De verzoamelinge van rationoale getalln èt als notoatie .
'n Rationoal getal kan in 't tiendêlig stelsel 'n antal cyfers "achter de komma" èn, zelfs 'n oeneindig antal. In da geval zyn die cyfers repeterend, da wil zeggn da n antal van die cyfers de hêlen tyd were kommn.
De uptellienge, oftrekkienge,vermenigvuldigienge en dêlienge van rationoale getalln es "inwendig", da wilt zeggn da de uutkomste were n rationoal getal es. D'er zyn nateurlyk getalln daj nie lik 'n breuke kunt schryvn, bevôorbild , π. Da zyn irrationoale getalln. De verzoamelienge van de rationoale én de irrationoale getalln tegoare es de verzoamelienge van de reële getalln.
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