30×70= 50×80= 23×20=

560÷8= 4200÷6= 720÷8=

1.3-0.7= 4.5+ 1.5= 5-2.5=

5+5×6= (25+27)÷6= 63÷9×8=

fill (up) a vacancy

1, this year is a year, * * one day, the first quarter * * one day.

2. The general map determines the direction according to the up, down, left and right.

3 □36÷5, if the quotient is three digits. The smallest in □ can be filled in, and the largest in □ can be filled in if the quotient is two digits.

4. A truck departs from A at 9: 35 a.m. and arrives at B at 3: 35 p.m. It takes hours on the way.

5, 5 square meters = (square decimeter = 80000 square meters hectares.

6. Arrange the following figures in descending order.

3.25、3.05、32.5、3.56

▂﹤▂<； ▂<； ▂

7 Fill in the appropriate units.

The third grade classroom area is 48%; The area of an orchard is 12%.

Xiaohong's height is 124 (the area of a stamp is 9).

8. □ = ○+○ = 50 and then□ = ○ = ○.

Three. To judge whether the statement is correct, mark "√" for the right and "×" for the wrong.

1, integer is greater than decimal ()

2. The product of two digits multiplied by two digits is four digits. ﹙﹚

3. When three digits are divided by one digit, the quotient may be three digits or two digits.

4. A square with a side length of 4 cm and an equal perimeter and area.

The first quarter of a normal year has 90 days.

Fourth, choose the serial number of the correct answer.

The product of 1 and 625× 16 has zero at the end.

① 1 ②2 ③3 ④4

The area of an orchard is 40%.

① Square decimeter ② Square meters ③ hectares ④ Square kilometers

3. When checking the division with remainder, it depends on whether the dividend is equal to.

① quotient× divisor ② divisor× remainder ③ divisor× quotient+remainder

There are ~ days in the first half of 4.20 10.

① 18 1 ② 182 ③ 183 ④ 180

5. When estimating 53×77, treat them as (easier to do oral calculations).

A 50×77 B 53×70 C 50×70

Verb (abbreviation for verb) calculation

1, calculated vertically; 748÷5 95×24 35×58

2. Calculation: 927+23×5 24÷6×48 57-369÷9

Estimation of intransitive verbs

32×48≈ 86×33≈ 42×92≈

623÷7≈ 80 1÷9≈ 343÷5≈

Seven-column calculation

What is the quotient of the sum of (1)52 and 123 divided by 5?

What is the product of 425 times the sum of 23 and 38?