May 21
Today’s date, my peeps, is a #FactFamily date
5 21 =26
Or if you prefer
21 5 =26
Questions:
1. Does every month have such a date?
2. What’s the last year when this wasn’t true? What the next time this won’t be true?
#CalendarMath #MathIsAllAroundUs
2
172
9 Apr 2025
Today's a square number day
Regardless of how you write it
4/9/2025
or
4/9/25
or
9/4/25
or
9/4/2025
0r
2025/9/4
All numbers are squares
#CalendarMath #MathIsAllAroundUs #Numb3rs
2
4
536
11 Nov 2024
Today's date - 11/11 - is a binary number (base 2)
It's the largest binary number in the calendar
mm/dd
Date Value
01/01 - 5
01/10 - 6
01/11 - 7
10/01 - 9
10/10 - 10 (I love this coincidence!)
10/11 - 11
11/01 - 13
11/10 - 14
11/11 - 15
#CSforAll #CalendarMath
1
2
5
185
2 Apr 2024
In the most impractical date representation - mm/dd/yy, today's date - 4/2/24 - is a palindrome 😃
#Palindrome #CalendarMath
3
102
24 Jan 2024
I almost forgot!
Today's a fact family day!
1 23 = 24
And for the non-US folks
23 1 = 24
#MathIsAllAroundUs #CalendarMath #ILoveDates
3
93
20 Dec 2023
Making calendar math digital 💪
Now everyone is ready to answer some morning math questions! #Room10 #ThirdGrade #Muffley
@MurrayKelli @PDICoz @pranstead #CalendarMath
2
36
1 Jan 2023
Today date - 1/1/23 is #FibonacciDay 😀
And it’s the same in both US and nonUS formats 👍🏽
#CalendarMath #MathIsAllAroundUs #Math #Maths
4
348
16 Sep 2022
Other "two square" dates:
Jan 1, 4, 9, 16, 25
Apr 1, 4, 9, 16, 25
Sep 1, 4, 9, 16, 25
The last square year was 1936 (44*44)
The next one: 2025 (45*45)
#ItsHipToBeSquare #CalendarMath #MathIsAllAroundUs
16 Sep 2022
Today's date 9/16 (or 16/9 for the rest of the world) has two squares - 9 and 16.
▫️⏹️
Previous "two square" date was - Sep 4th
Next two "square date" is in 9 days - Sep 25th
And that's the last double square date of the year
#dailySTEM #MathIsAllAroundUs #FactFamily
ALT Screenshot of output of a #Python program drawing two squares
1
2
16 Sep 2022
@BarcroftEagles mathematicians engaging in language-rich conversations #calendarmath #numbersenseroutines @APSMath @APS_ESOL
2
6
2 Sep 2022
🎶 how’s the weather? how’s the weather today? 🎶
Well, August was SU N N Y in Room 111. 🤩 #tens #ones
We LOVE comparing/contrasting Louisville’s weather in our morning meetings. ☀️☁️☔️ @McFerranKY @LDJones01 #room111 #weatherjournal #calendarmath #wishingforrainbows
1
5
27 Jul 2022
woops, it was 2006 i'm just old and can't do calendarmath
4
15 Dec 2021
Today's date in the US format - 12/15/21 - is an interesting mathematical progression of multiples of 3.
12/15/21 --> dd 3 = mm and mm 6 = yy
#FactFamily #CalendarMath
2
5 Dec 2021
3
1
5
2 Dec 2021
Love that the first nine dates of this month this year is a consecutive sequence of palindromes:
12.1.21
12.2.21
12.3.21
12.4.21
12.5.21
12.6.21
12.7.21
12.8.21
12.9.21
When was the last time this happened? When will be the next?
#calendarmath #iteachmath
1
2
25 Nov 2021
619 days later at the school campus :) It's always an enriching experience to be working from a happy classroom❤️
#makingthemostoftheresources #patternsonthelegowall
#calendarmath @ois_primary @twisha_b @nehaminda @chchkiwiT @PYP_Teacher Hopeful to see kids back at the campus!
2
21
Calendar math got a little exciting this week thanks to the complement party the class has earned. Learning about whole, halves, and fourths this month! #countryhillselementary #mathrocks #calendarmath
3
10 Oct 2021
Today’s date is a perfect 10 😀
1010 - in binary (base 2) is 10 decimal
(2^3 2^1)
And of course, it’s 10/10 (in both mm/dd and dd/mm formats)
Like I said, a pefect 🔟
#CalendarMath #dailySTEM
1
3
17 Sep 2021
4th grdrs are working on Calendar Math! We are studying shapes & patterns, multiplying & adding money to deposit into our bank, and writing number equations. #CalendarMath #ThisIsFun #WeWillBeRich @GroveAve220
1
9
26 Aug 2021
Day 14: We are thankful for Calendar Math. All students in grades kinder through 7th use this program to review important math skills every day. #avideagles #TheSilverValleyWay #calendarmath
3
7
21 Jan 2021
Overflowing with “excitement” as we explore capacity this morning! 🍚@marandahoova #calendarmath
1
3