Fill in the Blanks Decenas.Online version Calculamos con decenas. by =Itz Only M.S= ❤ 1 a ) 30 + 20 + 40 = b ) 70 + 20 + 10 = c ) 40 + 40 - 10 = d ) 90 + 10 - 10 = e ) 30 + 50 - 40 = f ) 20 + 30 - 30 = g ) 100 - 20 + 10 =