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