Ms. Key

5th Grade Math

Warm-ups: Nov 16, 2006

Posted by AKey on November 16, 2006

warm-ups1.jpg

(You will post your answers as a group.)

Write the prime factorization of:

Period 1                              Period 2

1. 16                                           1. 42

2. 24                                           2. 20

3. 32                                           3. 58

Find the Greatest Common Factor (GCF) of :

Explain how you got the answer.

4. 48 and 46                      4 . 30 and 40

5. 16 and 36                       5 . 42 and 36

6. 24 and 18                       6. 36 and 45

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11 Responses to “Warm-ups: Nov 16, 2006”

  1. P1G2 said

    D.J.,C.A.,A.K.,J.H.

    1.2x3x3
    2.2x3x4
    3.2x2x2x4
    We did a doubble bubble for numbers 4-6.

    4.2
    5.4
    6.6

  2. P1G5 said

    T.J C.R D.F A.M R.E

    1. 2x2x2x2 2. 2x3x4 3. 2x2x2x4

    4. GCF=2 5. GCF=4 6. GCF=3

    Because we had to times that number many times to find the greatest common factor (GCF).

  3. P1G1 said

    E.R., A.H., K.H., S.A., C.W.,
    1. 2x2x4
    2. 2x3x4
    3. 2x4x4
    4. 48,46 Gcf:2
    5. 16,36 Gcf: 4
    6. 24,18 Gcf: 6
    We got the answer by listing all the factors of each number and underlined the ones that have the same thing in common and the highest factor we underlined is the GCF.

  4. P1G2 said

    D.J.,C.A.,A.K.,J.H.

    1.2x3x3
    2.2x3x4
    3.2x2x2x4
    We did a venn diagram for numbers 4-6.

    4.2
    5.4
    6.6

  5. P1G3 said

    SV SM ES NM

    1. 2x2x2x2

    2. 2x2x2x3

    3. 2x2x2x4

    4.48 & 46
    1×48 1×46
    6×8
    GFC=1

    5.16 & 36
    1×16 4×9
    4×4 1×36
    2×8 12×3

    6.24 & 18
    1×24 1×18
    3×8 6×3
    2×12 2×9

  6. P2G3 said

    JL AB NH LV HI
    1. 2x3x7
    2. 2×29

    3. 7x2x2x2
    4. 30 40
    1×30 1×40
    5×9 5×9 GCF=5
    3×10 2×20 30;1,2,3,5,6,15,16,30
    2×15 2×15 40;1,2,4,5,8,10,20,40
    5.42 36
    1×42 1×36
    2×21 2×18 GCF=3
    3×14 3×12 42;1,2,3,7,14,21,42
    3×12 4×8 36;1,2,3,4,9,12,18,36
    6.36 45
    1×36 1×45
    2×18 5×9 GCF=1
    3×12 36;1,2,3,4,9,12,18,36
    6×6 45;1,5,9,45

  7. P2G1 said

    K.C., P.A., C.J., D.H.

    1. 2x3x7
    2. 2x2x5
    3. 2×59
    4.30:40:GCF=10
    5. 42:36:GCF=6.
    6.36:45:GCF=9

    We found the answer by listing the factors,and underling the graetest common factors.

  8. P2G4 said

    DZ.DS.AT.TN
    1.42.
    1X42
    6X7
    21X2

    2.20
    1X20
    2X10
    4X5

    3.58
    1X58

    4.30:1,3,30,10
    40:1,4,9,36 GCF=1

    5.42:1,6,7,21,2
    36:1,4,9,36 GCF=1

    6.36:1,4,9,36
    45:1,5,9,45 GCF=9

    We get the answer by showing the factors.

  9. P2G2 said

    A.Q., S.L., T.J., I.O.
    1. 2x3x7
    2. 2x2x5
    3. 1.2.29
    4. GCF=10
    5. 45:36: GCF = 6
    6. GCF: 9
    We used a venn diagram to find the GCF. We put all the factors of each number for their side of the circle. Then we put the numbers that each of them has the same in the middle of the oval. The biggest number in the middle is the GCF

  10. P2G1 said

    Dear Miss Key you are nice becuase you take care of as and you are special to me.

  11. AKey said

    Thank you P2G1! 🙂

  12. P1G5 said

    CP, RA, DE, JS, ST

    1. 42
    2 X 21
    2 X 3 X 7

    2. 20
    5 X 4
    5 X 2 X 2

    3. 58
    2 X 29

    4. 30:1, 3, 5, 6 10, 30
    40:1, 4, 5, 8, 10, 40 gcf =10

    5. 42: 1, 6, 7, 42
    36: 1,3, 4, 9, 12, 36 GCF = 9

    6. 36: 1,2,3,4,9,12,18,36
    45: 1,5,9,45 GCF = 9

    I find the GCF by finding all the factors of 2 numbers and then finding the greatest number that is a factor of BOTH numbers.

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