Gcse Grade C Exam Practice Worksheet With Answer Key - Alperton Community School Page 5
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28Number: Primes, factors, multiples
1.
(a)
Express the following numbers as products of their prime factors.
(i)
60,.............................
(ii)
96..............................(4)
(b)
Find the Highest Common Factor of 60 and 96.
.............................(1)
(c)
Work out the Lowest Common Multiple of 60 and 96.
............................(2)
(Total 7 marks)
2.
(a)
Express 120 as the product of powers of its prime factors.
……………………………(3)
(b)
Find the Lowest Common Multiple of 120 and 150.
……………………………(2)
(Total 5 marks)
3.
(a)
Use the information that 13 × 17 = 221 to write down the value of
(i)
1.3 × 1.7..........................
(ii)
22.1 ÷ 1700..........................(2)
(b)
Use the information that
13 × 17 = 221
to find the Lowest Common Multiple (LCM) of 39 and 17 ................(2) (Total 4 marks)
4.
(a)
Express 108 as the product of powers of its prime factors.
.........................
(3)
(b)
Find the Highest Common Factor (HCF) of 108 and 24.........................
(1)
(Total 4 marks)
2
5.
3x
= 108
(a)
Find the value of x.
x = ………………………
(2)
(b)
Express 108 as a product of its prime factors.
………………………(3)
(Total 5 marks)
Alperton Community School Maths Department: GCSE Grade C Exam Practice
5
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