3. Han's calculation of 972 = 9 is shown here.
a. Find 180 - 9.
1 80
9 9 7
- 9
7 2
72

b. Use your calculation of 180 . 9 to explain how you know Han
has made a mistake.
c. Identify and correct Han's mistake.

3 Hans calculation of 972 9 is shown here a Find 180 9 1 80 9 9 7 9 7 2 72 b Use your calculation of 180 9 to explain how you know Han has made a mistake c Iden class=