Fourth grade interesting mathematics logical thinking training topic Logical thinking training fourth grade interesting mathematics training topic (1)
Make pancakes in a pan. You can only put two pancakes at a time. It takes 2 minutes to fry a cake (65438+ 0 minutes on both sides). Please think about it. How many minutes does it take to fry three cakes? How to fry?
Think again: How long does it take to fry 99 cakes and 100 cakes? What about bombing n? Why?
Logical Thinking Training Interesting Mathematics Training in Grade Four (2)
How much should I put in brackets?
The arrangement of numbers in the following two tables is regular. Can you find this rule and fill in the numbers in brackets according to this rule? Just try it. It was fun.
2 、 5 、 6 、 7 、 1 1
8 、 10 、()、4 、 18
6 、 10 、 12 、9 、20
2 、 13 、 5 、 6
4 、 1 1 、 5 、 7
7 、()、 4 、 10
7 、 1 1 、 1 、 12
Logical thinking training fourth grade interesting mathematics training questions (3)
Clever filling of operation symbols
Without brackets, fill in the appropriate operation symbols between four 4.
(+、? 、? 、? ), make
4 4 4 4=0
Thinking training fourth grade interesting mathematics (4)
Clever brackets
Please put brackets in the following formula to make it hold.
( 1)4? 6+24? 6-5= 15
(2)4? 6+24? 6-5=0
Logical thinking training fourth grade interesting mathematics training questions (5)
A classmate accidentally wrote the subtraction 65 as 56 when doing a subtraction problem, and finally the difference was 40. What should be the correct answer?
Thinking Training Topics of Interesting Mathematics Training in Grade Four (6)
There are 48 students in one class. The class teacher asked? Raise your hand if you finish your Chinese homework? 37 people raised their hands. Ask again:? Raise your hand if you finish your math homework? 42 people raised their hands. Finally, ask: raise your hand if you haven't finished writing Chinese and math? No one raised their hands. Please calculate, how many people in this class have finished learning Chinese and math?
Thinking training fourth grade interesting mathematics (7)
Fill in the appropriate numbers in the box below.
1、360? (6? □)=20
2、 125? (28? □)=500
Thinking Training Interesting Mathematics Training in Grade Four (8)
What if Delta? □= 0 So which of the following formulas is correct?
( 1)□? 〇=△ (2)〇? △=□
(3)〇? △=□ (4)□+〇=△
(5)〇-□ =△ (6)△=〇? □
Logical thinking training fourth grade interesting mathematics training questions (9)
Xiao Mahu is doing a calculation problem (1800-□)? 25+ 192, I didn't pay attention to the brackets in the question. Divide the number in □ by 25, and then calculate in the order of addition and subtraction to get 1968. How much should I get for this problem?
Thinking Training Interesting Mathematics Training Topics for Grade Four (10)
A classmate lost the decimal point while reading it, and the result was 4500 1. The original decimal number had only one zero. What should the original decimal be?
Thinking training questions for fourth-grade students (1 1)
The problem of finding regular numbers requires us to find out the law according to the relationship between known numbers, so as to get the corresponding numbers.
There are generally two ways to find rules from sequences:
(1), according to the relationship between the two numbers before and after, find out the law and infer the number to be filled in.
(2) According to the relationship between two or more adjacent numbers, find out the law and infer the number to be filled in.
Please find out the rules of the numbers in the following columns first, and then fill in the appropriate numbers in ().
( 1)2、6、 10、 14、( )、( ).
(2) 18、 19、2 1、24、28、( ).
(3)2、4、8、 16、( ) ..
(4) 12、2、 10、2、8、2、( )、( )
(5) 1、 1、2、3、5、8、 13、2 1、( )、()
(6)2、3、5、9、 17、( )
(7)99、36、 15、( )
(8)0、 1、3、8、2 1、( )
Topic selection of interesting mathematical logical thinking training in grade four 1. How to ask questions?
There are two people, A and B. Among them, A only tells lies and doesn't tell the truth. B only tell the truth, not lies. But when they answer other people's questions, they just nod and shake their heads to show that they don't talk. One day, a man was faced with two roads: Road A and Road B, one leading to the capital and the other to a small village. At this time, there are two people standing in front of him, A and B, but he doesn't know whether this person is A or B. He doesn't know? Nod? Is this a sign? what's up Or say? No? . Now, he must ask a question before he can determine which road leads to Beijing. So, how should I ask this question?
2. What are their occupations?
Xiao Wang, Xiao Zhang and Xiao Zhao are good friends. One went into business, one was admitted to a key university, and the other joined the army. In addition, they also know the following: Xiao Zhao is older than the soldiers; College students are younger than Xiao Zhang; Xiao Wang's age is different from that of college students. Please infer which of these three people is a businessman. Who is a college student? Who is the soldier?