There are 8 pears in 1 and 1kg, and the ratio of 1kg apples to 1kg pears 1kg. My mother bought 2 Jin of pears and 2 Jin of apples, as well as apples and pears ().
2. A snail climbed 25cm forward,15cm backward,10cm forward, and finally climbed () cm forward.
Xiao Ming wrote five big characters on the first day, and every day after that, he wrote two more big characters than the day before. Six days later, Xiao Ming wrote ().
There are six empty seats on the bus. When the bus arrived at Unity Station, no one got off, but nine people got on, and there were two seats left. Some of them got on the bus.
() People are standing.
Both boxes of apples weigh 40kg. After taking 8 kilograms from the first box to the second box, the second box is () kilograms more than the first box.
6. Eight colored flags are inserted on the right side of the school gate, with the distance between each two colored flags being 2m, and there is () m between the 1 colored flag and the 8th colored flag.
7. For a three-digit number, the number on the tenth digit is 9, which is exactly three times that of the single digit. The sum of three digits is 13. This three-digit number is ()
8. Dongdong is 10 years old, and his father is 40 years old. When Dongdong was () years old, his father was exactly twice as old as Dongdong.
Xiaoming planted five trees. Everyone in Daqiang, Li Wei, Dahua and Dongdong planted as many trees as Xiaoming. They planted () trees one by one.
10, on Sunday, Xiaogang boiled water and made tea at home. Washing teapot: 1 min, boiling water: 15 min, washing teacups: 1 min, and taking tea leaves: 2 min. Q: Xiaogang needs at least () minutes to make tea.
1 1. In the evening, when Xiaohua was doing his homework under the lamp, the power suddenly went out and Xiaohua pulled the switch twice. After mom came back, she went to Xiaohua's room and pulled the switch three times. After the phone call, the light in Xiaohua's room () (fill in "On" or "Off")
12, the peaches on Huaguoshan are ripe, and the little monkey is busy picking peaches on the tree. The first time, it picked half the peaches on the tree. When it got home, it picked two peaches from the tree. The second time, it picked all the remaining eight peaches from the tree. Little monkey * * * picks back () peaches.
13, during the festival, the colorful lights in front of the school are arranged in the order of 2 red, 3 yellow and 4 blue from left to right. From left to right, lantern 12 is (), and lantern 36 is ().
14. Pour a glass of water into an empty bottle, which weighs * * *140g. If you pour three glasses of water, the bottle weighs 260 grams. The weight of an empty bottle is () grams.
15, Li Nainai has 16 eggs, and there are two hens that lay an egg every day. If Li Nainai's family eats four eggs a day, her family can eat them for () days.
18, a caterpillar grows from larva to adult and grows every day.
Twice as big, it can grow to 20 cm in 30 days. Ask to 5.
It takes () days to make a centimeter.
19, every three empty bottles can be replaced with a soda. Someone bought 27 bottles of soda, and then changed them into empty bottles, so he could drink at most () bottles of soda.
20. Find a rule to fill in numbers.
2 1, Xiaohong does the calculation because
Inadvertently, I mistook an 8 with several digits for a 3 and a 6 with a hundred digits for a 9. The total is 138, and the total is 438. What is the correct sum? (writing process)
22. Xiao Ming wrote 3 in the minuend as 5 and 6 in the decimal system as 0, so the difference is 189. What is the correct difference? (writing process)
23, ○+○ =15, ○+△ = 19 and △-△ = ()
24. Make a four-digit number with two 5s and two 0s. When no zero is read, this number is (), and when only one zero is read, this number is ().
A five-story tower has two lights on the top floor and four lights on the lower floor of each floor. How many lights should be installed on the ground floor? (writing process)