Dates as operations
Activity
Quickly access this link using gomaths.net/dates.
Updated for 2024.
Like most teachers I write the date at the top of the whiteboard each day. As an extra point of interest, in 2016 I endeavoured to write a number sentence using the digits of the date, in order, underneath the date.
For example:
7/4/16 7 - √4 = -1 + 6
27/5/16 2 + 7 - 5 = √16
(Date written as dd/mm/yy)
This is the Google Sheet, feel free to contribute, for 2024.
Previously: 2017, 2018, 2019, 2020, 2021, 2022, 2023.
16 January 2018 Edit: 29 January 2024
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Comments
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MrsK on 05 August 24 at 10:25 AM #
The 5 caused problems for 5/8/24 so I used the floor function again:
⌊√5⌋ - 8 = -2 - 4
Other suggestions?
MrsK on 01 July 24 at 11:25 AM #
Things have been OK for a while, but the 7 is making things difficult for July. (Luckily a lot of July is holidays!)
I’ve had to use the floor function for 2/7/24 and 4/7/24:
2 - ⌊√7⌋ = 2 - √4
4 - √(7 + 2) = ⌊√(√4)⌋
As always - other suggestions very welcome!
MrsK on 29 April 24 at 10:18 AM #
I also looked up this site to check where the decimal point is supposed to go these days!
https://www.stylemanual.gov.au/grammar-punctuation-and-conventions/numbers-and-measurements/fractions-and-decimals
MrsK on 29 April 24 at 10:12 AM #
I couldn’t find an equation for 2/5/24, but then I came up with this inequality, and thought it might be fun!
(for stage 4 I think): 2.5 > 2.4
Any comments welcome!
MrsK on 10 February 24 at 11:51 AM #
I’ve been thinking this year could be quite difficult. Too many even numbers!
I’ve already had issues with 7/2/24. I’ve come up with a solution using the floor function, but any other solutions gratefully received!!!
7 = ⌊√2 ⌋ + 2 + 4
MrsK on 04 September 23 at 05:37 PM #
Another problem day - 7/9/23. I’ve used a factorial because I couldn’t come up with anything for stages 3/4. Any suggestions welcome!
MrsK on 08 June 23 at 06:40 PM #
And the same with 8/6/23.
I also found that I’d made some mistakes with the dates themselves. Have fixed them now for all pages.
MrsK on 08 May 23 at 04:41 PM #
And another. 8/5/23. I’ve had to use a floor function (integer part). Other suggestions welcome!
MrsK on 01 May 23 at 04:48 PM #
Next problem day for this year! 3/5/23. A little questionable to have the decimal point without a zero preceding, and for it to be on the ground. Anyone have a better suggestion?
MrsK on 06 March 23 at 12:38 AM #
First problem for 2023. Used a factorial for 7/3/23. As always, any other suggestions gratefully received.
MrsK on 12 December 22 at 12:42 PM #
OK. All done for this year. No more problems since August.
MrsK on 08 August 22 at 06:54 PM #
Problem number 6 - 5/8/22. Had to use integer part/floor function again. As always, any other suggestions gratefully received!
MrsK on 06 June 22 at 12:44 PM #
And problem number 5 - 9/6/22. Had to use integer part/floor function. Any other suggestions gratefully received!
MrsK on 29 May 22 at 05:07 PM #
4th problem for 2022 - 3/6/22. I got it with a factorial, but no luck stage 3 or 4.
MrsK on 14 May 22 at 10:53 PM #
3rd problem for 2022 - 2/5/22. Again, got an expression using integer part/floor function, but other suggestions appreciated!
MrsK on 04 April 22 at 01:38 PM #
2nd problem for 2022 - 7/4/22. I can do it with integer part/floor function, but any suggestions using stage 3 or 4 syllabus appreciated! Looks like the 7th is going to cause the problem dates!
MrsK on 06 February 22 at 02:36 PM #
The only date we couldn’t do without factorials or integer parts last year was 8/2/21. I think this year may be harder - already have a problem with 7/2/22, so I used Integer part. Any other suggestions gratefully received though!
MrsK on 09 February 21 at 02:53 PM #
I had to use factorials for 8/2/21. Anyone find anything else?