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Infringement complaint *"Top Ten" Thinking Training Questions in Primary School Mathematics*

"Top Ten" Thinking Training Questions in Primary School Mathematics (116)

Participating Teacher Name Li Cui'e School Daxin Road Primary School Internet Research Member Number

1. The father and son have a total of 60 losses this year. It is also known that 4 years ago, the father was exactly three times his son. How old is the son this year?

Analysis and answer: 4 years ago, the sum of the age of the father and son was: 60-4 × 2 = 52 years old, and the age of the son 4 years ago was 52 ÷ (1 + 3) = 13 years, then the age of the son this year is 13 + 9 = 17 years old.

2.A × 1 is known

twenty three

= 13 × 80% = C ÷ 75% = D ÷

45

= E ÷ 1 and none of A, B, C, D, E

5

1

For zero, arrange A, B, C, D, and E in ascending order. The second number is ()

Analysis and answer: Assuming A ×× 80% = C ÷ 75% = D ÷, then, arrange A, B, C, D, and E from the smallest to the second 544

5

5

3

4

3

5

5

5

62

4

1

3

Is C

3. As shown in the figure, the side length of the small square is known to be 9 cm. Find the area of the shaded part in the figure.

Analysis and Answer: Connect AC, S Yin = S △ ACG + S △ GCE- S △ ACE, △ ACE and △ ACG have the same height, S △ ACE = S △ ACG, and S △ ACE = S △ ACH + S △ HCE, S △ ACG = S △ ACH + S △ AHG So S △ AHG = S △ HCE, the area of the shaded part is half of the area of the small square. That is 9 × 9 × 2 square centimeters.

4. The express train and the local train leave relatively from A and B. If the local train runs for 2 hours first, the local train will exceed the midpoint 24 kilometers when the two trains meet. If you are happy to drive for 2 hours first, 72 kilometers away from the midpoint when you meet If you drive at the same time, you can meet in 4 hours. How many kilometers per hour does an express train travel over an hourly train?

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