Money Matters Student Question Sheet Page 2
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2FOR MATHS WHIZZES!
More challenging activities on addition and subtraction
Addition and subtraction with pounds, shillings and pence is complex because it uses multiples of 12
(pennies) and multiples of 20 (shillings).
ADDITION – remember that 20s = £1 and 12d – 1s
E.g. ❶ No conversions are required.
N.B.: Sums are written without a stroke between
E.g. ❷ Pennies must be converted into shillings
the pounds, shillings and pence.
and shillings into pounds.
£
s
d
£
s
d
1
10
10
2
17
8
+
2
5
1
+ 3
18
4
3
15
11
6
16
00
In example ❷, 8 + 4 = 12; 12 pence make 1 shilling, leaving us with no pennies (which we write as 00, and
1 shilling that we add on to the shillings in the middle so that the addition becomes 17 + 19 = 36. 36
shillings converts to 1 pound and 16 shillings (36 - 20). We write down the 16 and add the 1 to the pounds
so that the addition becomes 2 + 4 = 6. Thus the answer is £6/16/-.
5. Calculate the following additions:
a) £
s
d
b) £
s
d
c) £
s
d
2
5
6
3
10
9
4
12
8
+ 1
6
5
+ 2
7
3
+ 6
11
7
_
_
_
An easier way to both add and subtract is to convert everything into shillings and pence. E.g.:
£2/17/8 = 57/8
£3/18/4 = 78/4
(convert the 12d to 1 shilling)
135/12 = 136/- = £6/16/00 or £6/16/-
Try doing question 5 again using this method.
a) __________
b) __________
c) __________
SUBTRACTION
Add 12d to 4 so the subtraction becomes 16 - 8
E.g.:
(add 1s to 17s = 18s)
£
s
d
£
s
d
2
10
8
or 50/8
3
18
4
-
1
5
7
25/7
-
2
17
8
1
5
1
25/1 = £1/5/1
1
00
8
6. Calculate the following subtractions:
a) £
s
d
b) £
s
d
c) £
s
d
2
5
6
3
10
7
6
11
7
- 1
4
5
+ 2
11
10
+ 4
12
8
_
_
_
P a g e
| 2
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