Răspuns :
253-39=214(cls3)<br />253+214=467(cls2)<br />467+25=492<br />492+467+214+253=1426<br />
1)253-39=214(elevi in clasa a treia )
2)214+253=467(elevi in clasa a doua). 3)467+25=492(elevi in clasa întâi )
4)253+214+467+492=1426(elevi in clasa primara)
253+(253-39)+253+25=1426