Do oral calculations.
240÷4 400÷5 640÷4 160÷8
40× 10 1 1×80 22+69 0÷6
30× 15 14×20 60×80 240÷8
2. Use vertical calculation.
49×78 80×45 132÷2
32×77 406÷4 568÷4
Fifth, measure the length of the side first, and then calculate the perimeter and area. (Unit: cm)
Perimeter: Perimeter:
Area: area:
Sixth, solve the problem.
1 96 people from two classes in Grade Three went for a spring outing. Each class is divided into four groups. How many people are there in each group on average?
Two boxes of apples weighing 20 Jin have been finished. How many Jin did you eat?
2. A rectangular vegetable field, with a length of16m and a width of 5m. How many square meters is this vegetable field? If fenced, how many meters is the fence?
3. A square vegetable field with a side length of 20 meters can harvest 2 kilograms of tomatoes per square meter. How many kilograms of tomatoes can be harvested in this land?
The side length of square floor tile is 8 cm. Xiaoliangjia decorated the living room with 75 such tiles. How many square meters is the floor of Xiaoliangjia living room?
6. The TV screen is 44 cm long and 34 cm wide. What is its circumference and area?