47 + 15
47+ 15 = 62
28 + 23
28 + 23 = 51
Show base 10 form for 36
3 tens sticks, 6 ones
67 + 16
67 + 16 = 83
79 + 15
79 + 15 = 94
66 + 38
66 + 38 = 104
Press F11 Select menu option View > Enter Fullscreen for full-screen mode