1. There are 90 ping-pong balls in the sporting goods. If every two are packed in a box, can they be packed properly? If you pack a box every five, can you finish it? Why?

90÷2=45 boxes 90÷5= 18 boxes

A: If you pack two boxes, you can finish the packing. If you pack a box every five, you can finish the packing. Because 90 can divide five equally.

The sum of the sides of the cube is 60 cm. How many square centimeters is its surface area?

The side length of a cube is 60÷ 12 = 5 cm.

The surface area is 5×5×6= 150 cm2.

Answer: The side length is 5 cm, and the surface area is 150 cm 2.

3: A and B type a document of 10000 words, A type 1 15 words per minute, and B type 135 words per minute. How many minutes will it take?

10000? (115+135) = 40 points.

A: It will be completed in 40 minutes.

4. A class held a parent-teacher meeting and prepared teacups for each parent. As a result, five cups were missing. Later, I borrowed half the cup. There are 13 cups at this time. How many parents attended the meeting?

(5+13)1/2+5 = 41person

A: There were 465,438+0 parents attending the meeting.

5. The fifth-grade students planted trees, 13 or 14. Each group has just finished. How many students took part in planting trees in grade five?

13X 14= 192 people

A: At least 192 people participated in tree planting in the fifth grade.

6. The side length of the cube is 1.5 decimeter. What is the sum of its sides? How many square decimetres is its bottom area?

1.5× 12= 18 decimeter

1.5× 1.5=2.25 square decimeter.

Answer: The total side length is 18 decimeter, and the bottom area is 2.25 square decimeter.