1 Whole numbers
Australia
Year 7
1.08 Square roots and perfect squares
Worksheet
1
State whether the following numbers are perfect squares:
a
6
b
25
c
49
d
44
e
18
f
144
g
36
h
12
2
Evaluate the following:
a
4^{2}
b
7^{2}
c
9^{2}
d
12^{2}
e
9^{2} + 6
f
3^{2} + 7^{2}
g
7^{2} + 9^{2}
h
100^{2} + 10^{2}
i
7^{2} - 3^{2}
j
9^{2} - 8^{2}
k
12^{2} - 6^{2}
l
100^{2} - 10^{2}
3
Harry was working out 2^{2} \times 5^{2} and thought that he could simplify the expression using the fact that 2 \times 5 = 10.
a
Evaluate 2^{2} \times 5^{2}, by first expanding and evaluating each square.
b
Now, using the fact 2 \times 5 = 10, evaluate 10^{2}.
c
Is 2^{2} \times 5^{2} = \left( 2 \times 5\right)^{2} a true statement?
d
Calculate 4^{2} \times 2^{2} using the above method.
4
Given that we know 5 \times 5 = 25. What is \sqrt{25}?
5
Evaluate the following:
a
\sqrt{4}
b
\sqrt{16}
c
\sqrt{121}
d
\sqrt{144} + \sqrt{64}
e
\sqrt{144} - \sqrt{64}
f
\sqrt{6^{2} + 8^{2}}
g
\sqrt{13^{2} - 12^{2}}
h
\sqrt{13^{2}} - \sqrt{12^{2}}
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