Can you use the digits on the left of this clock along with any mathematical operations to equal the digits on the right (also with any mathematical operations)?
Which times is this possible and which times impossible?
Use the digits of the current time to make as many different calculations as possible all with different answers.
All four digits must be used and each must appear once only in each of your calculations.
Next choose a different time that you think will produce more calculations than the present time.
How did you use this starter? Can you suggest
how teachers could present or develop this resource? Do you have any comments? It is always useful to receive
feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
Click here to enter your comments.
|09 24||√9+0=3, 3!=6||2+4=6|
|09 28||90=1||82=64, 6+4=10, 1+0=1|
|09 29||0+9=9||92=81, 8+1=9|
For more ideas see Alan Sturgess' Maths Puzzle Investigation video.
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Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a related student activity.
The digital clock used on this page is adapted from code provided by Radoslav Dimov copyright © 2009.