alexseanchai:jenroses: prismatic-bell: 7 + 8 = 15Therefore, _52 + 4 = 6, therefore 65Carry the ten f
alexseanchai:jenroses: prismatic-bell: 7 + 8 = 15Therefore, _52 + 4 = 6, therefore 65Carry the ten from the 15, 6 + 1 = 7, therefore 75 60+15 move 2 from the 27 to the 48 and now it’s 25 + 50or 3 from the 48 to the 27 and now it’s 30 + 45 40 plus 20 is 60, plus 8 is 68, plus 2 is 70, plus (7-2) is 75 -- source link
#mental math