Lesson 12
1. Count by half inches to 12 on your own ruler.
2. Lakeview Zoo had 15 gallons of milk in the tank for the baby
elephant. In half a day, the elephant drank 12 gallons. A worker
then added another 65 gallons of milk to the tank.
How much milk was in the tank then?
Solution
Subtract the milk the
Add the milk the worker
elephant drank.
put into the tank.
gallons of milk
4
Solve. Carry or borrow as needed.
3 5
2
4 5 0
6 5
2 7
6 6 3
2 2
3
3.
+ 2 8 9
+ 1 7
+ 2 4
+ 2 7 6
+ 7
+ 5
4.
9 5 2
5 2 9
3 2 9
6 7 5
– 4 1 7
– 2 7 9
– 1 5 6
– 5 4 7
52