Exercise 1.5 Primes, Powers And Square Roots Worksheet - Heinemann Maths Zone Page 10
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118 Find the first three multiples of:
1.4
(a) 7
(b) 10
(c) 12
(d) 52
9 Find the LCM of:
1.4
(a) 3 and 8
(b) 4 and 16
(c) 6 and 9
(d) 20 and 25
10 Choose the correct answer. The LCM of 2, 5 and 9 is:
1.4
A 10
B 18
C 45
D 90
E 15
11 Find all the factors of:
(a) 35
(b) 31
(c) 44
(d) 48
(e) 51
(f) 100
12 Find the HCF for each of these.
1.4
(a) 11 and 55
(b) 90 and 60
(c) 72 and 64
13 Choose the correct answer. The HCF of 14, 28 and 56 is:
1.4
A 14
B 1
C 7
D 56
E 28
14 Write factor trees and express each number as a product of prime factors.
1.4
(a) 24
(b) 30
(c) 88
(d) 200
15 Write each of these numbers in index form.
1.5
(a) 7 × 7 × 7 × 7 × 7
(b) ten cubed
(c) five squared
(d) 12 to the power of 8
16 Write each of these out in expanded form, then work out the answer.
1.5
− 2
) × 16
3
4
2
3
2
(a) 5
(b) 8
(c) (3
17 Evaluate the following.
1.5
(a)
64
(b)
900
(c)
225
Applications
18 Put brackets into these statements, where necessary, to make them true.
1.3
(a) 4 × 2 + 3 ÷ 5 − 1 = 3
(b) 5 + 1 ÷ 6 + 4 + 2 = 7
19 (a) Copy the following pattern and complete it using your calculator.
1.4, 1.5
=
=
=
2
2
2
66
666
6666
(b) Look at the pattern in part (a) and without using a calculator copy
and complete the following.
=
=
=
2
2
2
66 666
666 666
6 666 666
= 1
+ 3. Now copy and complete these.
2
2
20 (a) Look at this pattern: 2
1.4, 1.5
= 2
+
= 3
+
= 4
+
2
2
2
2
2
2
(i) 3
(ii) 4
(iii) 5
(b) Describe the relationship between a square number and the square
number before it.
(c) Using the relationship established in part (b), complete these.
= 11
+
= 19
+
2
2
2
2
(i) 12
(ii) 20
10
21 Is 2
larger or smaller than 1000? Write the difference.
1.5
26
H e i n e m a n n
M A T H S Z O N E
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