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BECE Mathematics 2014 Paper
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© africaexams.com
Question : 6
Total: 40
Find the smallest number which is divisible by 16 and
20
?
40
80
120
160
Validate
Solution:
L.C.M of 16 and 20
Prime factors of 16
Prime factors of
16
=
2
×
2
×
2
×
2
=
2
4
Prime factors of 20
Prime factors of
20
=
2
×
2
×
5
=
2
2
×
(5)
The L.C.M is the product (multiplication) of each of the prime factors in their highest power
L.C.M of 16 and
20
=
2
4
×
5
=
16
×
5
=
80
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