125×8= 75÷ 15= 1+

Fill in the blanks.

① () square centimeter = 1500 square decimeter = () square meter.

② One year = () quarter = () month.

The product of two digits of ③ and the smallest three digits is (), which is estimated to be about ().

(4) 4 kilograms of apples are sold at 10 yuan, and the unit price is ().

⑤ The rectangle has an area of 90 square meters, a length of15m and a circumference of ().

Third, the judge.

① The perimeters of two squares are not equal, but the areas may be equal. ( )

② The area of a square with a side length of 1 cm is 1 square decimeter. ( )

③ The commonly used length units are square centimeter, square decimeter and square meter. ( )

The year 2000 is a leap year.

Fourth, calculation.

① 169 19÷56 ②6 10-48×9

Check calculation:

③(600-352)×20+ 10

5. Column calculation. What's the number of 480?

② What is the quotient of the sum of 40 and 30 divided by 420?

What is the quotient of the sum of 75 and 25 divided by their difference?

Sixth, the application problem.

① The length of a rope is120m. First, cut it in half, and then divide each paragraph into three equal parts. How long is each part? (Solve in two ways)

② The weight of three ducks 14kg. According to this calculation, how many kilograms does 12 duck weigh?

③ The side length of a square is12m. How many rectangles with an area of 6 square decimeters can be cut from it at most?