Look at the picture.
commutative property a + b = b + a
... (-5 + 1/2 + 5) = ... (-5 + 5 + 1/2)
inverse property of addition a + (-a) = a - a = 0
... (-5 + 5 + 1/2) = ... (0 + 1/2)
identity property of addition a + 0 = 0 + a = a
... (0 + 1/2) = ... 1/2
inverse property of multiplication a/b · b/a = 1
37 · 2 · 1/2 = 37 · 2/1 · 1/2 = 37 · 1
identity property of multiplication a · 1 = 1 · a = a
37 · 1 = 37
