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# "Top Ten" Thinking Training Questions in Primary School Mathematics

"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?

1

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