Interesting math problems about the Spring Festival in the fourth grade mathematics of primary school

Grade one and grade two of primary school: The Spring Festival is coming, and Xiaoming's parents go out to buy new year's goods. A * * * takes money from 300 yuan and spends money from 250 yuan. How much is left?

The third and fourth grades of primary school: The Spring Festival is coming, and Xiaoming's parents go out to buy new year's goods. I bought two fish and three packs of gifts. I know that every fish costs 35 yuan money, and every package of gifts costs 60 yuan. Q: How much is a * * *?

Grade 5 and 6: The Spring Festival is coming, and Xiaoming's parents go out to buy new year's goods. A * * * brought 300 yuan money, bought two fish and three packages of gifts, and left 50 yuan money. Suppose each package of gifts is 60 yuan. Q: How much is a package of gifts and a fish?

Junior one, junior two: The Spring Festival is coming, and Xiaoming's parents go out to buy new year's goods. A * * * brought 300 yuan money, bought two fish and three packages of gifts, and left 50 yuan money. The price ratio of fish and gifts is 7: 12. Xiao Gang's parents came after Xiao Ming's parents left. In the case of buying the same fish and gift package, Xiaogang's parents want to buy 4 fish and 5 gift packages. Q: How much will Xiaogang's parents spend? The exam begins now.

Please answer the question carefully.

There are five questions in this exam. Please answer them in the order of one to five questions. Don't miss the answer, answer less.

The words "1, Happy New Year" stand for different numbers. Please replace these words with numbers to make the equation hold.

(Wish-Congratulations) ×× Spring × (Good Festival) =9

Zhu-(He Chun)-Anta = 1

Wish+Congratulations+Spring-(Festival+Beautiful) =9

Zhu-He+Chun× (Good Festival) =7

After solving the problem, I realized,

Good luck and good heart.

There is no solution to this problem.

2. guess riddles.

Lights are on on New Year's Eve,

Colorful lights are bright and dazzling.

When the number is three or three, the integer is used up.

On the count of five, there is one left.

It is a coincidence that the number is seven seven.

There were still three missing when the number was eight or eight.

Please guess,

There are at least () kinds of lights.

Answer: 2 1 lamp has n lamps, n/3 is an integer, n- 1/5 is an integer, n/7 is an integer, n+3/8 is an integer, and the solution is n=2 1.

3. Guess the tongue twister.

There are hundreds of contestants, and Xiao Ming is the youngest.

To know how old he is, please look at the tongue twister:

"Age plus age, age minus age.

Age multiplied by age, age divided by age;

All of them add up to exactly one hundred. "

Please calculate,

Xiaoming is () years old this year. for reference only