Numeracy Worksheet - Castlebrae Community High School - 2012 Page 18
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47FHS Numeracy
Evaluating Formulae
contents page
To find the value of a variable in a formula, we must substitute
all of the given values into the formula, then use BODMAS
rules to work out the answer.
Step 1: write formula
Step 2: substitute numbers for letters
Step 3: start to evaluate (BODMAS)
Step 4: write answer
P =
L +
B
P
L
B
Example 1
Use the formula
2
2
to evaluate
when
= 12 and
= 7.
Level 3
P
L
B
= 2
+ 2
BODMAS rules come into play.
P
= 2 x 12 + 2 x 7
Multiply before
add.
P
= 24
+
14
P
= 38
V
V
R
Example 2
Use the formula I =
to evaluate I when
= 240 and
= 40
R
Level 3
V
I
=
R
240
I
=
40
I
= 6
F
C
F
Example 3
Use the formula
= 32 + 1.8
to evaluate
when C = 20
Level 3
F
C
= 32 + 1.8
BODMAS rules come into
play.
F
= 32 + 1.8 x 20
Multiply before add.
F
= 32 + 36
F
= 68
18
L Watson 2012
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