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Hong Kong Primary Mathematics Challenge (2014-2015)

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小四組Primary 4

第一屆全港小學數學挑戰賽(2014-2015)

The 1

st

Hong Kong Primary Mathematics Challenge (2014-2015)

小四組 個人項目 答案

Primary 4 Individual Event Answer

1. 星期三 2. 40 cm 3. @ = 10 4. 4

5. 48, 96, 144 6. 24

7. 3+4÷2÷1 / (1 + 4) × (3 – 2) / 2 × 4 – 3 × 1/ 32 – 4 × 1/ 12-(3+4)/ (1+2)÷3 +4/ 或其他可行答案 8. 286800

9. 51

10. 1 + 7 = 8 3 + 6 = 9 9 – 6 = 3 或 8 – 7 = 1 5 × 4 = 20 5 x 4 = 20 11. 1111104

12. 23 13. 33 14. 1

15. 甲(345),乙(455) 16. x = 66

17. 20 個

18. A = 7, B = 4, C = 6, D = 1, E = 8 19. 下午 3 時 48 分

A 車的速率 = 60 km/h,B 車的速率 = 40 km/h 它們於 180 ÷ (60 + 40) = 1.8 小時 = 48

160 小時 後相遇。

20.

2

4

5

1

3 4

2

1

5

3

1

(2)

小四組Primary 4

第一屆全港小學數學挑戰賽(2014-2015)

The 1

st

Hong Kong Primary Mathematics Challenge (2014-2015)

小四組 組別項目 答案

Primary 4 Group Event Answer

1. 257 元 2. 9 3. ▲▲△

4. C, E 5. 10008 6. 860 7. 0 8. 408 9. 10000 10. 1008000

9999 + 999 × 999

= 9000 + 999 + 999 × 999

= 9000 +999(1 + 999)

= 9000 + 999000

= 1008000 11. 909

(

13 17 19 23 29 31 37 41 43 47

)

50 14

13

12+ + ++ − + + + + + + + + +

909 300 1209− =

= 12. 144 13. 20.5 km 14. 170.5 cm2

2

2 2 2 2 1

2 8 4 2 1 170.5

2

 + + + +  =

   

   

 

15. 550

160 32 5

8 * 52

20 13 260

* = 160 + 32 + 5 + 52 + 260 + 13 + 20 + 8 = 550

2

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