LCM(2 Numbers)
Multiple choice question
LCM(3 Numbers)
Word problem
GCF/LCM
100
Find the LCM of 3 and 4.
The LCM of 3 and4 is: 12
100
已知三位數40A是10的倍數，A是什麼數字？ (1)1　(2)2　(3)5　(4)0
(4)
100
Find the LCM of 9, 15 and 12.
LCM=180
100
媽媽買了一袋蘋果，數量在80顆以上，15顆一數剛好數完，這袋蘋果最少有幾顆？
《答案》90顆 詳解：80÷15＝5…5 5＋1＝6，15×6＝90
100
Solve each word problem by finding GCF or LCM. The table below shows the number of students in the school choir. School Choir Students Number Girls 48 Boys 64 The choir teacher plans to arrange the students in equal rows. Only girls or boys will be in each row. What is the greatest number of students that could be in each row? A. 16 B. 12 C. 8 D. 4
48 – 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 64 – 1, 2, 4, 8, 16, 32, 64 GCF = 16 (Answer Choice: A)
200
Find the LCM of 4 and 10.
LCM = 20
200
有一個五位數45□13，是3的倍數，□中不可能是下面哪一個數字？ (1)2　(2)5　(3)6　(4)8
(3)
200
Find the LCM of 9, 21 and 33.
LCM=693
200
志明大約有150顆～170顆彈珠，每7顆裝成一袋，剛好可以裝完。志明可能有多少顆彈珠？
《答案》154顆、161顆或168顆 詳解：150÷7＝21…3 7×22＝154 7×23＝161 7×24＝168
200
Solve each word problem by finding GCF or LCM. Pencils come in packages of 10. Erasers come in packages of 12. Phillip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 eraser per pencil. How many packages of pencils and erasers should Phillip buy? A. 4 packages of pencils and 3 packages of erasers B. 5 packages of pencils and 4 packages of erasers C. 6 packages of pencils and 5 packages of erasers D. 12 packages of pencils and 10 packages of erasers
10 – 10, 20, 30, 40, 50, 60 12 – 12, 24, 36, 48, 60 LCM = 60 60 ÷ 10 = 6 packages of pencils 60 ÷ 12 = 5 packages of erasers Answer Choice: C
300
Find the LCM of 22 and 6.
LCM=66
300
觀察12×5＝60這個算式，下列哪些敘述是正確的？(　　　　　) (A)12是60的倍數 (B)60是12的倍數 (C)5是60的倍數 (D)60是5的倍數
B,D
300
Find the LCM of 14, 4 and 28.
LCM=56
300
Janice and Jasmine were each given a piece of ribbon of equal length. Janice cuts her ribbons into equal lengths of 2 m, while Jasmine cuts her ribbons into equal lengths of 5 m. If there was no remainder in both cases, find the shortest possible length of ribbon given to them. HCF/ LCM (circle)
LCM 10
300
Solve each word problem by finding GCF or LCM. Boxes that are 12 inches tall are being stacked next to boxes that are 18 inches tall. What is the shortest height at which the two stacks will be the same height?
12 – 12, 24, 36 18 – 18, 36 LCM = 36 The two stacks will be the same height at 36 inches.
400
Find the LCM of 42 and 38.
LCM=798
400
下列敘述何者錯誤？ (1)9的倍數一定是3的倍數　 (2)某數是6的倍數，那麼某數一定是2或3的倍數　 (3)如果個位數字是0的整數，一定是10的倍數　 (4)同時是2的倍數也是4的倍數的整數，一定是6的倍數
(4)
400
Find the LCM of 36, 24 and 12.
LCM=72
400
On a track for remote-controlled racing cars, racing car A completes the track in 28 seconds, while racing car B completes it in 24 seconds. If they both start at the same time, after how many seconds will they be side by side again? HCF/ LCM (circle)
LCM 168
400
Solve each word problem by finding GCF or LCM. Kiara baked 30 oatmeal cookies and 48 chocolate chip cookies to package in plastic containers for her friends at school. She wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If she wants each container to have the greatest number of cookies possible, how many plastic containers does she need?
30 – 1, 2, 3, 5, 6, 10, 15, 30 48 – 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 GCF = 6 Kiara needs 6 plastic containers for her cookies.
500
Find the LCM of 78 and 42.
LCM=546
500
關於公因數和公倍數，下面哪一個敘述是錯誤的？ (1)1是所有非零整數的公因數 (2)兩個數的所有公倍數裡，可以找出1個最大的數 (3)兩個數的所有公因數裡，可以找出1個最大的數 (4)整除算式中，被除數是除數和商的公倍數
(2)
500
Find the LCM of 26, 78 and 52.
LCM=156
500
At the gym, Hillary swims every 6 days, runs every 4 days and cycles every 16 days. If she did all three activities today, in how many days will she do all three activities again on the same day?
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52. 6: 6, 12, 18, 24, 30, 36, 42, 48, 54. 16: 16, 32, 48 In 48 days she will do all three on the same day.
500
Solve each word problem by finding GCF or LCM. Beginning at 8:30 A.M., tours of the National Capitol and the White House begin at a tour agency. Tours for the National Capitol leave every 15 minutes. Tours for the White House leave every 20 minutes. How often do the tours leave at the same time? A. Every 15 minutes B. Every 30 minutes C. Every 45 minutes D. Every 60 minutes
15 – 15, 30, 45, 60 20 – 20, 40, 60 LCM = 60 The tours leave at the same time every 60 minutes. (Answer Choice: C)
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