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WorksheetsYear 8 - Formulae
Total questions: 11
Worksheet time: 8mins
Name
Class
Date
1.
V = IR
Find R when V = 18 and I = 6
(a)
2.
A = ½bh
Find b when A = 12 and h = 6
(a)
3.
Substitute x= 5 into the expression x2−5
a)
5
b)
25
c)
10
d)
20
4.
Substitute x= 3 into the expression 3x+1
a)
3
b)
9
c)
10
d)
7
5.
Substitute k= 7 and h = 5 into
k+h×3
a)
22
b)
36
c)
15
d)
21
6.
If a = 6 and b = 7,find the value of 15-a-b.
a)
2
b)
3
c)
4
d)
5
7.
6q +m - m when m =8 and q= 3
a)
63
b)
24
c)
18
d)
1
8.
What is the value of x in x + 12 = 17?
a)
2
b)
5
c)
6
d)
3
9.
What is the value of the expression, 9x² - 12x + 4, when x = 3?
a)
22
b)
49
c)
85
d)
345
10.
if x=2 and y =3 find:
xy +yx
a)
12
b)
10
c)
5
d)
17
11.
If x = 1, y = 3, and z = 2, what is the value of the expression 4xy + 3xz+ 7y?
a)
46
b)
42
c)
39
d)
23
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