Divisibility
DIVISIBILITY
Multiples and factors
Divisibility criteria
Prime and composite numbers
Decomposition of a number in prime factors (factorization)
Lowest common multiple (lcm)
Highest common factor (HCF)
Exam
Vocabulary
The end
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Exam
Exam
1. Decide which of these sentences is true:
a) 15 is a factor of 3
b) 3 is a factor of 15
c) 3 is a multiple of 15
d) 3 is divisible by 15
2. Decide which of these sentences is true:
a) 8 is a factor of 16
b) 16 is a multiple of 8
c) 16 is divisible by 8
d) All of them
3. 135.806 ...
a) ...is divisible by 11
b) ...is not divisible by 11
c) ...is divisible by 5
d) None of them
4. 4434...
a) ...is not divisible by 6
b) ...is not divisible by 3
c) ...is divisible by 6
d) None of them
5. 221...
a) ...is a composite number
b) ...is a coprime number
c) ...is a prime number
d) None of them
6. 113...
a) ...is a composite number
b) ...is a coprime number
c) ...is a prime number
d) None of them
7. The factorization of 2520 is...
a) 2
^{2 }
· 3
^{3}
· 5 · 7
b) 2
^{2 }
· 3
^{2}
· 5 · 7
c) 2
^{3 }
· 3 · 5 · 7
d) 2
^{3 }
· 3
^{2}
· 5 · 7
8. The factorization of 1350 is...
a) 2 · 3
^{3}
· 5
^{2}
b) 2
^{2}
· 3
^{3}
· 5
^{2}
c) 2 · 3
^{2}
· 5
^{3}
d) 2 · 3
^{2}
· 5
^{2}
· 7
9. lcm(24,36,54)=
a) 54
b) 108
c) 162
d) 216
10. HCF(12,18,24)=
a) 2
b) They are coprimes
c) 6
d) 4
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