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MAE3811–Sp. 2010 Mahoney–1
A Clock
Let’s say there is only one hand on the clock,
the hour hand. I’ll draw it when its needed.
If its 6 O’clock Now.
5 hours from now it will be….?
How could we write that as an arithmetic expression?
5 hours ago it was…?
How could we write that as an arithmetic expression?
MAE3811–Sp. 2010 Mahoney–2
A Clock II
If its 10 O’clock Now.
5 hours from now it will be….?
How could we write that as an arithmetic
expression?
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MAE3811–Sp. 2010 Mahoney–3
A Clock III
If its 2 O’clock Now.
5 hours ago it was….?
How could we write that as an arithmetic
expression?
MAE3811–Sp. 2010 Mahoney–4
Clock Arithmetic
To add [or subtract] numbers on a clock with
out referring to the clock picture it self use
the following algorithm:
•
_____________the two numbers using
regular whole number arithmetic
•
if the answer is bigger than _______,
Divide the answer by 12, and take the
___________.
The algorithm is summarized this funky formula:
This type of arithmetic is also called ______________ arithmetic.
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 Spring '11
 Mahoney
 Algebra, Addition, Subtraction, Elementary arithmetic, clock arithmetic

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