Madania Primary School

Grade 5Mathematics Worksheet

Midtest Reinforcement LCM-GCF

26th – 30th September 2011

Name: ______Class: ____ Day/date : ______

Solve the problems correctly.

  1. List all the factors of:

a. 45:______

b. 72:______

c. 100: ______

  1. List the first ten multiples of:
  1. 11:______
  2. 23:______
  3. 34:______
  1. Find the first five common factors between:
  1. 4:
  2. 6:
  3. 8:
  1. Find the first common multiples between:
  1. 3:
  2. 6:
  3. 9:
  1. Find the greatest common factor (GCF) for each group by using factor tree.

a. 24 and 36 b. 100 and 125

  1. Find the Least Common Factor (LCM) for each group by using factor tree.

a. 28 and 32 b. 24 and 30

  1. Three clocks ring once at the same time. After that, the first clock rings after every 90 minutes, the second after every 30 minutes, and third after every 60 minutes. After how many minutes will they again ring together?
  1. One trip around a running track is 440 yards. Onejogger cancomplete one lap in 8 minutes while the other can complete it in 6 minutes. How long will it take for bothjoggers to arrive at their starting point together if they start at the same time and maintain their jogging pace?
  1. Jackie spent the same amount of money on cassette tapes and compact discs. If tapes cost $12 and CDs cost $16, what is the least amount of total money she could have spent for both purchases?
  1. There are three fifth graders classrooms (A, B, and C) at the local elementary school. Room A contains 12 children, Room B contains 18, and Room C contains 24 children. All the fifth graders get together to play a game in the middle of the day. The teachers want the students to play in groups. Each group is consisted of the students from those three classes equally in the amount.
  1. Can you find the largest groups can be formed?
  1. How many students of class A, B, and C are there in each group?
  1. Three schools agree to a debate competition. Students from each school are divided into teams of equal size. What is the greatest number of students that each team can have if Midland has 150 students, Copeland has 162 students, and Abbott has 168 students?
  1. Some toys are 15 dollars each, some are 45 dollars each, and some are 60 dollars each. Find the least sum of money with which we can buy an exact number of toys of each kind?

1112-S1-G05-MA-WS-W09-RLA-110919-LCM-GCF 1