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2018澳洲AMC小學中年級組參考解法

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小 學 中 年 級 卷

1-10 3 1. 4 (A) 2 (B) 3 (C) 8 (D) 12 (E) 24 4 + 4 = 8 : (C) 2. 10 (A) (B) (C) (D) (E) A = 3×3 = 9 B = 2×4 = 8 C = 2+3+2 = 7 D = 4+4 = 8 E = 5+5 = 10 : (E) 3. 6 3 (A) (B) (C) (D) (E) 6 3 : (A)

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4. 11 19 (A) 7 (B) 8 (C) 9 (D) 10 (E) 11 19− 11 = 8 11 + 8 = 19 : (B) 5. (A) 20 mm (B) 21 mm (C) 22 mm (D) 25 mm (E) 30 mm 0 10 20 30 40 50 millimetres 20 mm 5 mm 25 mm : (D)

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7.

K

A

T

E

(A)

K

A

T

E

(B)

K

A

T

E

(C)

K

A

T

E

(D)

K

A

T

E

(E)

K

A

T

E

KA

TE

|

ATE

K

: (A) 23/8/2018

(5)

8. 8 30 15 20 20 1 2 3 4 5 6 7 8 9 101112 15 1 2 3 4 5 6 7 8 9 101112 (A) 5 (B) 15 (C) 30 (D) 45 (E) 60 8 30 8 45 9 00 9 15 9 30 9 45 8 30 8 50 9 10 9 30 9 50 8 30 9 30 10 30 60 : (E)

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9. 年級學 小 29 學 學 (A) 5 (B) 6 (C) 7 (D) 8 (E) 9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 年級學 4 + 14 + 3 = 21 29− 21 = 8 : (D) 23/8/2018

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10. (A) 1 2 (C) 3 1 (B) 2 2 (D) 1 1 (E) 4 1 1 1 2 (A)–(E) (A) 4 (B) 6 (C) 5 (D) 3 (E) 6 (A) 4 : (A) 2 (A)–(E) 1 1 2 1 4 1 4 (A) 1 2 1 2 1 4 1 4 (B) 1 2 1 4 1 4 1 4 (C) 1 2 1 4 (D) 1 4 1 4 1 4 1 4 1 2 (E) (A) : (A)

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11-20 4 11. 58 12 (A) 7 (B) 8 (C) 9 (D) 10 (E) 11 1 60 5 12 2 10 : (D) 2 58÷ 12 = 4 ...10 4 12 5 10 : (D) 23/8/2018

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12. 小 小 (A) 6 (B) 8 (C) 9 (D) 10 (E) 11 1 小 3× 3 × 3 = 27 9 中 5 5 19 27− 19 = 8 小 : (B) 2 小 小 2× 2 × 2 2× 2 × 2 = 8 小 : (B)

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13. 小 5 6 7 2 (A) 1 (B) 2 (C) 3 (D) 6 (E) 8 1 2 7 9 9 6 3 3 5 8 小 8 : (E) 2 小 6 12 6 2 8 : (E) 23/8/2018

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14. 中 小 (A) 小 (B) 小 (C) 小 (D) 小 (E) 小 3 6 9 12 15 ( ) 20c 40c 60c 80c 小 小 小 小 小 小 小 小 小 小 小 : (B)

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15. (A) (B) (C) (D) (E) 中 20 6 (C) (E) 小 (B) (D) (B) (D) (A) (A) : (A) 23/8/2018

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16. KAREN WARREN ANDREW (A) 6 (B) 7 (C) 8 (D) 9 (E) 10

W

W

W

A

A

A

R

R

R

R

R

R

E

E

E

N

N

N

KAREN WARREN K W R ANDREW R D 小 A D E K N R R W : (C) 17. 小 2 3

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18. 小 (A) 1 2 3 4 5 6 7 8 9 1011 12 (B) 1 2 3 4 5 6 7 8 9 1011 12 (C) 1 2 3 4 5 6 7 8 9 1011 12 (D) 1 2 3 4 5 6 7 8 9 1011 12 (E) 1 2 3 4 5 6 7 8 9 1011 12 9:00 am 10:00 am 學 11:00 am 11:30 am 12:30 pm 1:00 pm 2:00 pm 11 30 1 2 3 4 5 6 7 8 9 1011 12 12 30 1 2 3 4 5 6 7 8 9 1011 12 . (A)–(E) 中 (A) : (A) 23/8/2018

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19. 中 7 11 (A) 26 (B) 36 (C) 41 (D) 54 (E) 63 1 2 + 3 + 6 = 11 1 + 3 + 4 + 5 = 13 2 + 4 + 5 + 6 = 17 41 : (C) 2 1+2+3+4+5+6 = 21 21×3 = 63 中 10 + 8 + 4 = 22 63− 22 = 41 : (C)

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20. 1 3 小 (A) 10 (B) 12 (C) 14 (D) 15 (E) 16 1 2 3 6 14 1 14

6

6

1 2 3 1 2 3

6

6

1 2 3 1 2 3 2 3 3 2 1 1 1 1 1 14 1 14 : (C) 23/8/2018

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21-25 5 21. 小 中 中 小 (A) 5 (B) 6 (C) 8 (D) 9 (E) 12 1 30 中 36 小 20 5 9 小 : (D) 2 小 50 g 6 小 300 g 中 60 g 6 中 360 g 90 g 5 450 g 9 小 : (D) 小 50 g 中

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22. 小 10 (A) 8 (B) 9 (C) 10 (D) 11 (E) 12 24 22 18 16 21 19 18 22 1 24 6 6 + 6 22 2 10 5 6 + 6 + 5 21 4 6 + 6 + 4 19 3 6 + 3 = 9 : (B) 2 = 24÷ 4 = 6. = − 1 = 5. = − 2 = 3. + = 6 + 3 = 9 : (B) 23/8/2018

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23. 小 小 1 cm2 小 cm2 (A) 12 (B) 36 (C) 48 (D) 60 (E) 72 1

24

3

24

3

24

24

3

3

33

33

2× 24 + 4 × 3 = 60 cm2 : (D) 2 × 6 × (6 + 4) =

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24. 初 20 A 中 B 中 C D (A) A (B) B (C) C (D) D (E) A 1 4 20÷ 4 = 5 15 B 1 3 15÷ 3 = 5 10 C D 5 : (E) 23/8/2018

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25. 小 20 cm× 20 cm 8 cm× 8 cm 20 cm 20 cm ? ? 8 cm 8 cm (A) 8 cm (B) 6 cm (C) 4 cm (D) 3 cm (E) 1 cm 20 cm 8 cm 4 12 cm 1 4 3 cm

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26-30 000-999 26 6 27 7 28 8 29 9 30 10 26. 中 A C 15 中 A B 18 中 B C 13 中 B A B C 1 15 + 18 + 13 = 46 A B C 中 中 A B C 23 中 A C 15 中 B 8 16 : (016) 2 18 + 13 = 31 中 A B C 中 A B C 31 15 31− 15 = 16 : (016) 23/8/2018

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27. 3 11 1 2 7 N 3 11 33 N 33 66 99 132 165 · · · N 14 1 N 33 N 33 99 165 231 297 363 429 495 561 627 … N − 1 32 98 14 × X 98 14 14 7 7× 66 = 462 14 N 33 99 165 231 297 363 429 495 561 627 … N − 1 32 98 560 14 × X X 561 561 + 462 = 1023 561 : (561)

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28. 小 小 小 小 高 小 1 2 3 1 小 12 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 = 78 小 12 12 12× 78 = 936 小 : (936) 2 23/8/2018

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12 6 6 12 12 6 1 12 6 6 7 6× 12 × 13 = 936 小 : (936)

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29.a b c 0 9 abc a a b a b c + 1 0 0 0 2 0 1 8 1a + b + c = 8 a + b + c = 18 0 1 a + b + c = 8 1 2 a + b + c = 18 1 1 + a + b = 1 1 + a + b = 11 a + b = 0 a + b = 10 a + b = 0 a = b = 0 a + b + c = 18 a + b = 10 c = 8 1 + a = 10 a = 9 b = 1 abc 918 : (918) 2 a× 111 + b × 11 + c + 1000 = 2018 a× 111 + b × 11 + c = 1018 a≤ 8 b× 11 + c > 130 b ≥ 10 a = 9 b× 11 + c = 19 b = 1 c = 8 abc 918 : (918) 23/8/2018

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30. 1234567891011121314151617 . . . 100 1 99 9 10 20 · · · 90 100 199 20 中 100 101 102 103 104 105 106 107 108 109 110 120 130 140 150 160 170 180 190 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... ... ... ... ... ... ... ... ... (200 300 · · · ) 20 9 + 20 + 20 + 20 + 20 + 11 = 100 100 500 11 509 : (509)

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