Реши примеры на сложение и вычитание: 55+26, 91−19, 16+26, 75−14, 98−57; 21−13, 17+67, 85−16, 67−31, 78−41; 95−38, 16+78, 17+19, 85−24, 87−15; 57+37, 36−18, 72+24, 55+43, 73+16; 93−45, 41−14, 14+75, 58+31, 14+35; 68+16, 69+25, 37+21, 52+41, 31+68.

55+26=81; 91−19=72; 16+26=42; 75−14=61; 98−57=41.

21−13=8; 17+67=84; 85−16=69; 67−31=36; 78−41=37.

95−38=57; 16+78=94; 17+19=36; 85−24=61; 87−15=72.

57+37=94; 36−18=18; 72+24=96; 55+43=98; 73+16=89.

93−45=48; 41−14=27; 14+75=89; 58+31=89; 14+35=49.

68+16=84; 69+25=94; 37+21=58; 52+41=93; 31+68=99.