1, write directly.

13 ×0=0 14 × 25 = 1\ 10 56 × 12= 10 7 12 × 3 14 = 1\8 45× 35 = 27

9×7 18 =7\2 23 × 9 10 =3\5 425 × 100= 16 18× 16 =3 4 1 1 × 1 14 = 1

Second, think about it and fill it out.

1、38 +38 +38 +38 =(3\8 )×(4 )=( 3\2 )

2, 12 56 is (10); 23 of 24 is (16).

3. The triple of1013 is (30 ~13); .

5. Fill in > and

56×4 > 56 9×23 = 23×9 38× 12 & lt； 38

6. The circumference of a square with a side length of 12 decimeter is (2 decimeter).

There are 50 students in Class 7.6 (1), including 25 girls, 20 girls and 30 boys.

8. Read a book, the whole book is 19 every day and 1\3 for three days.

9. 25% of a bag of 25kg rice was eaten, and (10 )kg was eaten, leaving (15 )kg.

10 and 16 numbers greater than 30 are (181\ 6); The number of 34 less than 36 is (14 1\4).

Third, sit in the right position.

1, "The number of lambs is 38 of the number of big sheep", and (b) is the unit "1".

A, lamb b, goat c, uncertain

2. (c) must be greater than 1.

A, true fraction b, false fraction c, any natural number that is not equal to 0.

3. This year's output is more than last year's 1 10, and this year's output is equivalent to last year's (c).

a、 1 10 B、9 10 C、 1 1 10

4.12× (14+13) = 3+4 = 7, calculated according to (b).

A, multiplicative commutative law b, multiplicative distributive law c, multiplicative associative law

A rectangular vegetable field is 20 meters long and 34 meters wide. The formula for calculating the area is (c).

a、20×34 B、20× 34 +20 C、20×(20× 34)

The number in 6.35 where 9 is more than 27 is (A).

a、 19 B、 14 C、 1

Fourth, discerning right from wrong with a sharp eye.

2. 1 ton 45 weighs as much as 4 tons 15. (√ )

A wire is 3 meters long. It took 25 meters, leaving 35 meters. (× )

4 plus 25 of 60 equals 3 10 of 80. (√ )

5. The number of refrigerators is equivalent to 78 of TV sets, and the number of refrigerators is less than TV sets 18. (√ )

Fifth, look at graphic calculation.

400-(400× 3/5) = 160 (m)168+(168× 2/7) = 326 (ton)

Sixth, solve the problem.

1, A and B are 420km apart, and Car A has traveled 57km. How many kilometers has it traveled?

420×5/7=300 (kg) A: 300 kg.

2. An orchard covers an area of 20 hectares, including 25 kinds of apple trees and 0/4 kinds of pear trees. How many hectares of apple trees and pear trees are planted? 20×2/5× 1/4=2 (hectares) A: 2 hectares.

A shoe store bought 600 pairs of leather shoes. 15 of the total amount sold in the first week, and 38 of the total amount sold in the second week.

(1) What percentage of * * * is sold every two weeks?

1/5×3/8=3/40 A: 3/40。

(2) How many pairs are sold every two weeks?

600×1/5× 3/8 = 45 (double) A: 45 pairs.

(3) How many pairs are left?

600-45 = 555 (double) A: 555 pairs.

The sixth grade students donated money for the children in the disaster area. Class 6/kloc-0 donated 500 yuan, class 62 donated 45% of class 6/kloc-0, and class 63 donated 98% of class 62. How much are the donations from Class Six and Class Three?

500×4/5×9/8=50 yuan A: 50 yuan.

5. The original price of a suit 180 yuan, and the current price is lower than the original price 15 yuan. What's the current price?

180+(180×1/5) = 216 (yuan) A: 2 16 yuan.

6. I hope there are 2 16 students in the third grade of primary school, and there are 29 more students in the fourth grade than in the third grade. How many students are there in the fourth grade? 216+(216× 2/9) = 264 (people) A: There are 264 people.