A student solved this problem. Use the drop-down menus to justify steps 1 and 3.
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
8+ [4(16 +23)]
8 + [4(16) + 4(23)]
8 + (64 +92)
8 + (92 +64)
(8 +92) + 64
100 + 64
164
