Alexandra a cumparat 4 caiete de matematica, pentru a plati 20 de lei cat va plati mihai pentru 3 caiete de acelasi fel? rezolvare:
se scriu datele problemei altfel:
4 caiete20 lei
1 caiet20:4=5(lei)
3 caiete3•5=15(lei)
deci mihai va plati 15 lei pentru 3 caiete.
observatie: numărul caietelor ,,a crescut" sau ,,a scazut" de acelasi număr de ori​

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