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FOLOSIND PROPRIETATILE ADUNARII CALCULATI :a) 347+206+443+149 b) 2005+291+995+2109

Răspuns :

(347+443)+(206+149)=790+355=645
(2005+995)+(291+2109)=3000+2400=5400
a) 347+206+443+149=300+200+440+140+(47+6+3+9)=1080+65=1145

b) 2005+291+995+2109 =2000+200+900+2100+(91+9+5+95)=5400