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.
Topics: Starter  Arithmetic  Mixed  Number  Problem Solving  Puzzles
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.
If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:
This starter has scored a mean of 3.1 out of 5 based on 315 votes.
Previous Day  This starter is for 14 June  Next Day
09 01  0x9=0  0x1=0 
09 02  0x9=0  0x2=0 
09 03  0x9=0  0x3=0 
09 04  0x9=0  0x4=0 
09 05  0x9=0  0x5=0 
09 06  0x9=0  0x6=0 
09 07  0x9=0  0x7=0 
09 08  0x9=0  0x8=0 
09 09  90  90 
09 10  0x9=0  1x0=0 
09 11  9^{0}=1  1^{1}=1 
09 12  9^{0}=1  1^{2}=1 
09 13  9^{0}=1  1^{3}=1 
09 14  9^{0}=1  1^{4}=1 
09 15  9^{0}=1  1^{5}=1 
09 16  9^{0}=1  1^{6}=1 
09 17  9^{0}=1  1^{7}=1 
09 18  9^{0}=1  1^{8}=1 
09 19  9^{0}=1  1^{9}=1 
09 20  0x9=0  0x2=0 
09 21  √9+0=3  2+1=3 
09 22  9^{0}=1  2÷2=1 
09 23  0+9=9  3^{2}=9 
09 24  √9+0=3, 3!=6  2+4=6 
09 25  √9+0=3  52=3 
09 26  √9+0=3  6÷2=3 
09 27  0+9=9  2+7=9 
09 28  9^{0}=1  8^{2}=64, 6+4=10, 1+0=1 
09 29  0+9=9  9^{2}=81, 8+1=9 
09 30  0x9=0  0x3=0 
For more ideas see Alan Sturgess' Maths Puzzle Investigation video.
Your access to the majority of the Transum resources continues to be free but you can help support the continued growth of the website by doing your Amazon shopping using the links on this page. Below is an Amazon search box and some items chosen and recommended by Transum Mathematics to get you started.
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.