Grade 6 Math Circles Worksheet - University Of Waterloo, 2015 Page 2
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103. Find the GCD of the following pairs of numbers:
(a) 75 and 60
(b) 75 and 66
(c) 45 and 73
4. Find the LCM of the following pairs of numbers:
(a) 16 and 12
(b) 7 and 13
(c) 7 and 21
(d) 24 and 42
5. Is 45 319 divisible by 3?
6. Is 725 128 divisible by 4?
7. Is 34 272 divisible 6?
Fundamental Knowledge
A factor of a number is a whole number that divides evenly into the other number. So,
when you divide by a factor the remainder is zero. Factors come in pairs. When you divide
a number by one of its factors, the answer or quotient is the paired factor.
A prime number is a number whose only factors are 1 and itself.
A composite number is a number with factors other than 1 and itself.
All numbers are either prime or composite, except for the number 1, which is neither.
Try it out:
1. What are all the factors of 24?
2. What are all the factors of 150?
3. Classify the following as prime or composite.
(a) 37
(b) 52
(c) 63
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