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Factors ad multiples_worksheet 2_class 5 and 6


Factors ad multiples

Worksheet-1



Q1. Which of the following are prime numbers?
a.                  383
b.                  72
c.                   54
d.                 211
  
Q2. Find the GCF of 15 and 6.
a.                  5
b.                 6
c.                  3
d.                 2

Q3. What is the least common multiple of 8 and 10?
a.                  2
b.                  4
c.                   5
d.                  80
e.                  40

Q4. Is the first number a factor of the second number? 9, 146
a.          yes
b.           no


Q5. Is the first number a factor of the second number? 6, 168
a.                  yes
b.                  no


Q6. Carl has a soccer game every 4th day, Matt has one every 5th day. When will they have a game on the same day?
a.                  Day 9
b.                  Day 20

Q7. What is the LCM of 2, 3, 7?
a.                  126
b.                  21
c.                   42
d.                  63


Q8. What is the greatest common factor of 36 and 42?
a.                  12
b.                  8
c.                   6
d.                  2


Q9. Choose all that apply. The number 52 is
a.                  even.
b.                  odd.
c.                   prime.
d.                  composite.
e.                  a perfect square.


Q10. Which of the following pairs of numbers have a least common multiple (LCM) of 56?
a.                  2 and 28
b.                  7 and 8
c.                   4 and 14
d.                  3 and 17


Q11. What is the least common multiple of 6 and 8?
a.                  12
b.                  24
c.                   32
d.                  48


Q12. 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 the third after every 60 minutes. After how many minutes will they again all ring together?
a.                  90 minutes
b.                  120 minutes
c.                   180 minutes


Q13. What is the least common multiple (LCM) of 6 and 12?
a.                  6
b.                  12
c.                   24
d.                  60


Q14. Choose all that apply. The number 9 is
a.                  even.
b.                  odd.
c.                   prime.
d.                  composite.
e.                  a perfect square


Q15. Boxes that are 12 cm tall are being stacked next to boxes that are 18 cm tall. What is the shortest height at which the two stacks will be at the same height?
a.                  24 cm
b.                  36 cm
c.                   72 cm


Q16. What is the least common multiple of 4 and 15?
a.                  30
b.                  60
c.                   80
d.                  90


Q17. Two neon lights are turned on at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. In 60 seconds, how many times will they blink at the same time?
a.                  5 times
b.                  12 times
c.                   24 times


Q18. What is the greatest common factor (GCF) of 42 and 72?
a.       2
      b.      3
      c.       6
      d .      9

Q19. Mark whether True or False.

(a) 1 is a factor of every number.
(b) Every number is a factor of itself.
(c) The factor of a number can not be bigger than itself.
(d) 1 is a multiple of every number.
(e) Every number has a finite number of factors.

Q20. What is the least common multiple of 8 and 10?
a.        2
      b.      4
      c.       5
     d.      80
     e.      40


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