First divide 60 into (50) and (10).
(10) Subtract 9 to get (1).
Finally, add (50) and (1) to get the result.
Theme on the right:
First divide 54 into (44) and (10).
(10) Subtract 8 to get (2).
Finally, add (2) and (44) to get (46).
Difficulties: How to determine the point M? Because the side lengths of the left right-angled triangle are 3, 4 and 5 respectivel