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GCF and LCM

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  • What is the GCF of 12 and 28?
    4
  • List all the factors of 12.
    1, 2, 3, 4, 6,, 12
  • is 3 a factor of 51?
    yes
  • Is the number 8 a prime number?
    no
  • Mr. Medica has 16 erasers and 48 pencils. What is the greatest number of school kits Mr. Medica can make with no items left over?
    16 school kits
  • What is the GCF of 26 and 39?
    13
  • Is the number 20 is divisible by 4?
    yes
  • What is the LCM of 2 and 9?
    18
  • True or False? This list contains ALL the factors of 10 {1, 2, 5 }
    False
  • What is the GCF of 13 and 17?
    1
  • What is the LCM of 4 and 10?
    20
  • What is the GCF of 25 and 100?
    25
  • What is a composite number?
    a number with more than 1 factor pair
  • Is the number 20 a prime number?
    no
  • Mrs. Wenzel has 24 erasers and 18 pencils. What is the greatest number of school kits Mrs. Wenzel can make with no items left over?
    6 school kits
  • True or False? This list contains ALL the factors of 8 {1, 2, 4, 8 }
    True
  • Is 3 a factor of 10?
    no
  • What does the "C" in GCF stand for?
    Common
  • What is the GCF of 10 and 20?
    10
  • Mr. Goodwin says, "hello" to every 3rd student and "hola" to every 8th student. When will Mr. Goodwin say "hola" and "hello" to the same student?
    the 24th student
  • What is the GCF of 6 and 30?
    6
  • Is 7 a factor of 56?
    yes
  • Name the next three multiples of the number 4:
    8, 12, 16
  • What is the GCF of 20 and 50?
    10
  • Why is the number 2 so special?
    2 is the only even prime number
  • A radio station gives $25 to every 6th caller and $100 to every 15th caller. When will the radio statilon give a caller BOTH $25 and $100?
    The 30th caller
  • What is the GCF of 30 and 12?
    6
  • What is a prime number?
    a number with only 1 factor pair (or only 2 factors)
  • Is 8 a factor of 24?
    yes
  • What is the prime factorization of 28?
    2x2x7
  • What is the prime factorization of 12?
    2x2x3
  • Name the next three multiples of the number 6:
    12, 18, 24
  • Is the number 11 a prime number?
    yes
  • What is the GCF of 22 and 80?
    2
  • What is the LCM of 3 and 5?
    15
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