Matching Pairs Cálculo mentalOnline version Cálculo mental suma y resta by M. ELIZABETH COLCHA TOAPANTA 1 310 + 50 – 90 = 2 15 + 800 – 25 = 3 790 + 60 – 100 = 4 380 + 50 +95 = 5 400 + 40 – 250 = 6 700 – 90 + 55 = 270 790 525 655 750 190