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)?

Examples

Examples

Which times is this possible and which times impossible?

A Mathematics Lesson Starter Of The Day


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Topics: Starter | Arithmetic | Mixed | Number | Problem Solving | Puzzles

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  • The key to making this activity a successful starter is not just considering the current time but focussing on the question 'Which times is this possible and which times impossible?'. The question 'How many times can you find that are possible?' might lead to a list of similar mathematical operations (which is fine for some pupils) while dividing the class into small groups and assigning each group an hour of the day may encourage some more creativity. Let us know if your class make any interesting discoveries.

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This starter has scored a mean of 3.0 out of 5 based on 167 votes.


Previous Day | This starter is for 14 June | Next Day

 

Answers

Answers really depend on the level of mathematics involved so there are no definative answers to this activity.

Here are a selection of solutions covering the time from 9am to 9:30am

09 010x9=00x1=0
09 020x9=00x2=0
09 030x9=00x3=0
09 040x9=00x4=0
09 050x9=00x5=0
09 060x9=00x6=0
09 070x9=00x7=0
09 080x9=00x8=0
09 099090
09 100x9=01x0=0
09 1190=111=1
09 1290=112=1
09 1390=113=1
09 1490=114=1
09 1590=115=1
09 1690=116=1
09 1790=117=1
09 1890=118=1
09 1990=119=1
09 200x9=00x2=0
09 21√9+0=32+1=3
09 2290=12÷2=1
09 230+9=932=9
09 24√9+0=3, 3!=62+4=6
09 25√9+0=35-2=3
09 26√9+0=36÷2=3
09 270+9=92+7=9
09 2890=182=64, 6+4=10, 1+0=1
09 290+9=992=81, 8+1=9
09 300x9=00x3=0

For more ideas see Alan Sturgess' Maths Puzzle Investigation video.

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Laptops In Lessons

Teacher, do your students have access to computers?
Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

Here a concise URL for a version of this page without the comments.

Transum.org/go/?Start=June14

Here is the URL which will take them to a number game.

Transum.org/go/?to=Fifteen

 

 



Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

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This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...


The digital clock used on this page is adapted from code provided by Radoslav Dimov copyright © 2009.

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