Answer:40
Step-by-step explanation:
1. We can tell 120 is divisable by three. A trick I like to use is adding all the individual numbers with that numbers and seeing if the sum is divisible by three.
EX: 1+2+0=3 so we know 120 is divisible by three
7+2=9 so we know 72 is divisable by three.
2. divide the number by ten in your head.
120/10=12
3. 12/3=4
4. 4x10=40
5.120/3=40