ІІ ЧАСТИНА. I. Тисяча » 113-114

113. 50 + 70 = 120; 60 + 90 = 150; 60 + 50 = 110; 90 + 90 = 180; 40 + 80 = 120; 10 + 90 = 100; 600 – (300 – 200) = 600 – 100 = 500; 600 – 300 – 200 = 300 – 200 = 100. 114. 130 – 60 = 70; 70 + 90 = 160; 99 + 100 = 199; 180 – 90 = 90; 80 + 60 = 140; 620 – 20 = 600.