Iva Sallay
@findthefactors.bsky.social
Wife, Mom, Grandma, Recreational Mathematician, High School math specialist, creator of the Find the Factors puzzles. I IGNORE ALL DMs.
Pinned
Reposted by Iva Sallay
#mathsonholiday Tessellating pentagons in Bucharest
November 1, 2025 at 7:44 AM
#mathsonholiday Tessellating pentagons in Bucharest
Reposted by Iva Sallay
I’m going to #TryMathsLive with this problem from @findthefactors.bsky.social, created using @transum.bsky.social’s Digimoji, which was inspired by my game Digit Disguises.
I found your first puzzle easier to solve than your second puzzle, but I eventually was able to figure it out. I really like these puzzles a lot especially when only 8 or 9 equations are used. Can you solve mine? Digits -4, -3, -2, -1, 0, 1, 2, 3, 4 are disguised.
October 25, 2025 at 5:18 AM
I’m going to #TryMathsLive with this problem from @findthefactors.bsky.social, created using @transum.bsky.social’s Digimoji, which was inspired by my game Digit Disguises.
Reposted by Iva Sallay
Hello @davidkbutler.bsky.social - I had the urge to create (yet another) one-player online game/puzzle based on your Digit Disguises game. I have yet to try it out with students though.
www.transum.org/Maths/Puzzle...
Thanks so much for all the sharing you do. Have a great weekend!
www.transum.org/Maths/Puzzle...
Thanks so much for all the sharing you do. Have a great weekend!
Digimoji
Crack the emoji code by testing equations and spotting patterns.
www.transum.org
October 12, 2025 at 12:57 AM
Hello @davidkbutler.bsky.social - I had the urge to create (yet another) one-player online game/puzzle based on your Digit Disguises game. I have yet to try it out with students though.
www.transum.org/Maths/Puzzle...
Thanks so much for all the sharing you do. Have a great weekend!
www.transum.org/Maths/Puzzle...
Thanks so much for all the sharing you do. Have a great weekend!
Reposted by Iva Sallay
I almost always do it sum first now. See this one: bsky.app/profile/davi...
x^2+30x+224
Yes this looks like fun!
20+10=30, 20×10=200 too low but close
21+9=30, 21×9=189 wrong way!
19+11=30, 19×11=209 aha better
18+12=30, 18×12=216 close
17+13=30, 17×13 well that’s not even
16+14=30, 16×14=224 yay!
(x+16)(x+14)
This is a great example of using this method!
Yes this looks like fun!
20+10=30, 20×10=200 too low but close
21+9=30, 21×9=189 wrong way!
19+11=30, 19×11=209 aha better
18+12=30, 18×12=216 close
17+13=30, 17×13 well that’s not even
16+14=30, 16×14=224 yay!
(x+16)(x+14)
This is a great example of using this method!
October 4, 2025 at 8:28 PM
I almost always do it sum first now. See this one: bsky.app/profile/davi...
Reposted by Iva Sallay
I’m going to #TryMathsLive with this one from @howiehua.bsky.social. Let’s see…
If it takes Elmo 1 1/2 minutes to build a snowman and Rocco takes 2 minutes to build a snowman, how fast can they build a snowman if they work together?
October 4, 2025 at 11:26 PM
I’m going to #TryMathsLive with this one from @howiehua.bsky.social. Let’s see…
Reposted by Iva Sallay
How to convert into different bases:
September 6, 2025 at 2:23 PM
How to convert into different bases:
Reposted by Iva Sallay
Neat discovery: Two knots whose connected sum has an unknotting number less than the sum of the unknotting numbers of the knots. This provides a counterexample to an old conjecture.
New Knot Theory Discovery Overturns Long-Held Mathematical Assumption
Mathematicians have unraveled a key conjecture about knot theory
www.scientificamerican.com
September 3, 2025 at 1:26 AM
Neat discovery: Two knots whose connected sum has an unknotting number less than the sum of the unknotting numbers of the knots. This provides a counterexample to an old conjecture.
Reposted by Iva Sallay
MATHS TEACHERS: If you’re seeking ways to add quirky ‘real world’ maths to lessons next year I’ve updated my blog index robeastaway.com/blog/blog-in... .
You can use it to find odd applications of (say) quadratic equations. It’s the sort of thing you might use as a lesson starter (1/3) #TMiP25
You can use it to find odd applications of (say) quadratic equations. It’s the sort of thing you might use as a lesson starter (1/3) #TMiP25
Rob Eastaway
robeastaway.com
August 23, 2025 at 11:29 AM
MATHS TEACHERS: If you’re seeking ways to add quirky ‘real world’ maths to lessons next year I’ve updated my blog index robeastaway.com/blog/blog-in... .
You can use it to find odd applications of (say) quadratic equations. It’s the sort of thing you might use as a lesson starter (1/3) #TMiP25
You can use it to find odd applications of (say) quadratic equations. It’s the sort of thing you might use as a lesson starter (1/3) #TMiP25
Reposted by Iva Sallay
Start your week with this #yohaku. Fill in cells with 9 different factors of 126 to get totals shown in each row/column.
#mathsky #iTeachMath
#mathsky #iTeachMath
August 25, 2025 at 2:00 PM
Start your week with this #yohaku. Fill in cells with 9 different factors of 126 to get totals shown in each row/column.
#mathsky #iTeachMath
#mathsky #iTeachMath
Reposted by Iva Sallay
The huge difference between average and median wealth for the US is really telling.
www.visualcapitalist.com/wealth-per-p...
www.visualcapitalist.com/wealth-per-p...
Ranked: Countries With the Highest Wealth per Person in 2025
This visual compares the world's richest countries by their highest average and median wealth per person in 2025.
www.visualcapitalist.com
August 26, 2025 at 12:02 AM
The huge difference between average and median wealth for the US is really telling.
www.visualcapitalist.com/wealth-per-p...
www.visualcapitalist.com/wealth-per-p...
Reposted by Iva Sallay
Investigating the question - how many questions does someone need to get right before you start to think it is unlikely that they are guessing? #AMSPSummerSchool
@vwheelhouse.bsky.social conducting the 'impossible' Jimmi Hendrix quiz when statistical modelling at #AMSPSummerSchool
August 20, 2025 at 9:34 AM
Investigating the question - how many questions does someone need to get right before you start to think it is unlikely that they are guessing? #AMSPSummerSchool
Reposted by Iva Sallay
I was explaining to my Ukrainian colleague the phrase ‘There’s no such thing as a free lunch’. She told me the equivalent in Ukrainian is ‘The only free cheese is in the mousetrap’ - which is so much better
July 16, 2025 at 6:39 AM
I was explaining to my Ukrainian colleague the phrase ‘There’s no such thing as a free lunch’. She told me the equivalent in Ukrainian is ‘The only free cheese is in the mousetrap’ - which is so much better
Reposted by Iva Sallay
New Alg2 student asked me at open house if we were going to do the “graph project”this year. He’s been in planning his art all summer! It’s amazing how excited students are about math! robinkubasiak.substack.com/p/math-meets.... @desmos.com
Math Meets Art
My favorite day of the year has arrived.
robinkubasiak.substack.com
August 14, 2025 at 12:15 AM
New Alg2 student asked me at open house if we were going to do the “graph project”this year. He’s been in planning his art all summer! It’s amazing how excited students are about math! robinkubasiak.substack.com/p/math-meets.... @desmos.com
Reposted by Iva Sallay
I saw this math question on Who Wants To Be a Millionaire. Would you win $125,000? What would your strategy be?
August 14, 2025 at 8:35 PM
I saw this math question on Who Wants To Be a Millionaire. Would you win $125,000? What would your strategy be?
Reposted by Iva Sallay
August 13, 2025 at 1:13 AM
Reposted by Iva Sallay
90 Square Logic Puzzles - These magic square style puzzles will give your students plenty of mental math practice!
mathequalslove.net/90-square-lo...
#mtbos #iteachmath #puzzlingclassroom #logicpuzzles #edusky #mathsky
mathequalslove.net/90-square-lo...
#mtbos #iteachmath #puzzlingclassroom #logicpuzzles #edusky #mathsky
August 11, 2025 at 11:17 PM
90 Square Logic Puzzles - These magic square style puzzles will give your students plenty of mental math practice!
mathequalslove.net/90-square-lo...
#mtbos #iteachmath #puzzlingclassroom #logicpuzzles #edusky #mathsky
mathequalslove.net/90-square-lo...
#mtbos #iteachmath #puzzlingclassroom #logicpuzzles #edusky #mathsky
Reposted by Iva Sallay
If we subtract all the digits from any number, we will always get a multiple of 9. Let's see why!
August 12, 2025 at 4:12 PM
If we subtract all the digits from any number, we will always get a multiple of 9. Let's see why!
Reposted by Iva Sallay
Someone asked me what my favorite mathematical operation is and I told them it has to be subtraction. I just like making a difference.
August 2, 2025 at 6:49 PM
Someone asked me what my favorite mathematical operation is and I told them it has to be subtraction. I just like making a difference.
Reposted by Iva Sallay
Cool fraction pattern: You can write a unit fraction as a sum of two distinct unit fractions, and we can do this mentally!
July 30, 2025 at 3:35 PM
Cool fraction pattern: You can write a unit fraction as a sum of two distinct unit fractions, and we can do this mentally!
Reposted by Iva Sallay
I remember learning about the associative property in school and remembered it was so boring, but it can help us with mental math!
July 26, 2025 at 4:21 PM
I remember learning about the associative property in school and remembered it was so boring, but it can help us with mental math!
Reposted by Iva Sallay
Happy Pythagorean Triple Day to all who celebrate!
July 24, 2025 at 5:39 PM
Happy Pythagorean Triple Day to all who celebrate!
Reposted by Iva Sallay
Can you visualize fraction division on the number line? If not, give me around 90 seconds to explain it.
July 23, 2025 at 4:56 PM
Can you visualize fraction division on the number line? If not, give me around 90 seconds to explain it.
Reposted by Iva Sallay
Made me chuckle!
July 21, 2025 at 7:24 PM
Made me chuckle!
Reposted by Iva Sallay
NEW Grade Level Tangram Puzzles for the First Week of School (Kindergarten through Ninth Grade)
mathequalslove.net/grade-level-...
#mtbos #iteachmath #puzzlingclassroom #mathsky #edusky #firstdayofschool #firstweekofschool
mathequalslove.net/grade-level-...
#mtbos #iteachmath #puzzlingclassroom #mathsky #edusky #firstdayofschool #firstweekofschool
July 16, 2025 at 1:58 PM
NEW Grade Level Tangram Puzzles for the First Week of School (Kindergarten through Ninth Grade)
mathequalslove.net/grade-level-...
#mtbos #iteachmath #puzzlingclassroom #mathsky #edusky #firstdayofschool #firstweekofschool
mathequalslove.net/grade-level-...
#mtbos #iteachmath #puzzlingclassroom #mathsky #edusky #firstdayofschool #firstweekofschool
Fun fact: Pope Leo XIV earned a bachelors in mathematics before getting his masters of divinity.
May 9, 2025 at 2:58 AM
Fun fact: Pope Leo XIV earned a bachelors in mathematics before getting his masters of divinity.