450 1400 80 40

0 3.2 600 1.3

Second, choose.

1. A, C

2.B

3.B

4.C

5.C

Third, solve the problem.

1. Solution: 30× 1/6=5 (person) 30×2/5= 12 (person)

There are five students watching a movie. 12 people went to the library.

2. Solution: 36× 31=1116 (pieces)

A: You can write 1 1 16.

3. Solution: (9.2-5.2)×2=8 (kg)

9.2-8= 1.2 (kg)

A: 8 kilograms of oil; Barrel1.2kg.

Yizhiyuan

Fill the small barrel with water and pour it into the big barrel for the first time; Pour 2 kg for the second time (just full of vats); Then pour out the big bucket of water, pour the remaining 1 kg of water from the small bucket into the big bucket, and then pour in just 4 kg of water from the small bucket.