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Howie Hua

@howie_hua • 100,496 subscribers

I teach math to future elementary school teachers at Fresno State. I make math memes and explainer videos. https://t.co/ks70O6RaFv

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It's Mental Math Monday! How would you mentally calculate 95% of $300?

It's Mental Math Monday! How would you mentally calculate 95% of $300?

2,164,699 views

It's Mental Math Monday! How would you mentally calculate this: 75 is 30% of _____?

It's Mental Math Monday! How would you mentally calculate this: 75 is 30% of _____?

298,365 views

It's Mental Math Monday! What goes on in your head when you're mentally calculating 12×25?

It's Mental Math Monday! What goes on in your head when you're mentally calculating 12×25?

243,491 views

It's mental math Monday. How would you mentally calculate 48+49?

It's mental math Monday. How would you mentally calculate 48+49?

946,113 views

I don't mean to start any drama or anything but would you round 0.49999... to 0 or 1?

I don't mean to start any drama or anything but would you round 0.49999... to 0 or 1?

79,704 views

It's Mental Math Monday! Is 15.99/3.99 greater than 4, less than 4, or equal to 4? How are you thinking about it?

It's Mental Math Monday! Is 15.99/3.99 greater than 4, less than 4, or equal to 4? How are you thinking about it?

80,222 views

It's Mental Math Monday with math teacher Quinn from Missouri! How would you mentally calculate 25×35?

It's Mental Math Monday with math teacher Quinn from Missouri! How would you mentally calculate 25×35?

24,155 views

It's Mental Math Monday! Is 3.01/12.01 greater than, less than, or equal to 1/4? Please share how you would mentally do this.

It's Mental Math Monday! Is 3.01/12.01 greater than, less than, or equal to 1/4? Please share how you would mentally do this.

45,743 views

It's Mental Math Monday! How would you mentally calculate 135-57?

It's Mental Math Monday! How would you mentally calculate 135-57?

385,137 views

Its Mental Math Monday. How would you mentally calculate the total?

Its Mental Math Monday. How would you mentally calculate the total?

314,639 views

It's Mental Math Monday. How would you mentally calculate 2023-1976?

It's Mental Math Monday. How would you mentally calculate 2023-1976?

258,757 views

For today's Mental Math Monday, how would you mentally calculate this: 60 is 40% of ___?

For today's Mental Math Monday, how would you mentally calculate this: 60 is 40% of ___?

136,520 views

It's Mental Math Monday! How would you mentally calculate 47+48?

It's Mental Math Monday! How would you mentally calculate 47+48?

18,292 views

It's Mental Math Monday! How would you mentally calculate 2.5×24?

It's Mental Math Monday! How would you mentally calculate 2.5×24?

49,951 views

It's Mental Math Monday! What goes on in your head when you're mentally calculating 17+18?

It's Mental Math Monday! What goes on in your head when you're mentally calculating 17+18?

180,242 views

It's Mental Math Monday! If 20 cookies cost $36, how would you mentally calculate the cost of 6 cookies?

It's Mental Math Monday! If 20 cookies cost $36, how would you mentally calculate the cost of 6 cookies?

180,184 views

It's Mental Math Monday! If a pair of pants cost $80 but you have a 20% off coupon, how would you mentally calculate the new cost?

It's Mental Math Monday! If a pair of pants cost $80 but you have a 20% off coupon, how would you mentally calculate the new cost?

168,494 views

It's Mental Math Monday! How would you mentally calculate 112-49?

It's Mental Math Monday! How would you mentally calculate 112-49?

41,162 views

It's Mental Math Monday! Let's practice division. How would you mentally calculate 468÷3?

It's Mental Math Monday! Let's practice division. How would you mentally calculate 468÷3?

123,368 views

It's Mental Math Monday! How would you mentally calculate 2 1/2 × 4 1/2?

It's Mental Math Monday! How would you mentally calculate 2 1/2 × 4 1/2?

15,380 views

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Which Pokémon encounter is more likely: Bellsprout (a 20% encounter rate) in 5 encounters or Clefairy (a 1% encounter rate) in 100 encounters?
2:15
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Which Pokémon encounter is more likely: Bellsprout (a 20% encounter rate) in 5 encounters or Clefairy (a 1% encounter rate) in 100 encounters?

Howie Hua

285,155 views • 4 months ago

If you repeatedly flip a coin, which sequence is more likely to appear first: HTT or TTH? Believe it or not, one is 3 times more likely to appear first!
1:44
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If you repeatedly flip a coin, which sequence is more likely to appear first: HTT or TTH? Believe it or not, one is 3 times more likely to appear first!

Howie Hua

228,249 views • 3 months ago

When I was in high school, I didn't realize difference of two squares literally meant "What's the difference between these two squares?" Here's how we can visually show why x²-y²=(x-y)(x+y).
1:25
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When I was in high school, I didn't realize difference of two squares literally meant "What's the difference between these two squares?" Here's how we can visually show why x²-y²=(x-y)(x+y).

Howie Hua

347,404 views • 7 months ago

Do you know of this fun subtraction strategy?
1:37
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Do you know of this fun subtraction strategy?

Howie Hua

33,259 views • 20 days ago

Did you know you can subtract left to right? 😱
2:02
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Did you know you can subtract left to right? 😱

Howie Hua

24,003 views • 14 days ago

Which is greater: 2025²⁰²⁶ or 2026²⁰²⁵?
2:26
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Which is greater: 2025²⁰²⁶ or 2026²⁰²⁵?

Howie Hua

308,579 views • 8 months ago

The probability of finding a Pikachu in Viridian Forest is 5% so you just need 20 encounters to ensure finding a Pikachu, right? Math doesn't work out like that. Let's do the math to find the probability of encountering at least one Pikachu in 20 encounters.
1:33
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The probability of finding a Pikachu in Viridian Forest is 5% so you just need 20 encounters to ensure finding a Pikachu, right? Math doesn't work out like that. Let's do the math to find the probability of encountering at least one Pikachu in 20 encounters.

Howie Hua

161,097 views • 4 months ago

The decimal representation for 1/7s is really cool
1:16
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The decimal representation for 1/7s is really cool

Howie Hua

134,994 views • 4 months ago

It's Mental Math Monday! How would you mentally calculate 75% of 90%?
0:26
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It's Mental Math Monday! How would you mentally calculate 75% of 90%?

Howie Hua

27,242 views • 23 days ago

Will this answer surprise you? Or is it intuitive?
0:46
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Will this answer surprise you? Or is it intuitive?

Howie Hua

462,982 views • 1 year ago

This is a very common misconception in statistics: If 1% of a population has a disease and the tests have a 5% chance of giving a false positive, what's the probability of having the disease given that we tested positive? The answer is NOT 95%. It's actually way less.
3:04
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This is a very common misconception in statistics: If 1% of a population has a disease and the tests have a 5% chance of giving a false positive, what's the probability of having the disease given that we tested positive? The answer is NOT 95%. It's actually way less.

Howie Hua

95,981 views • 4 months ago

I know this is controversial but I'm saying it anyway: 8×3 and 3×8 are saying different things.
2:37
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I know this is controversial but I'm saying it anyway: 8×3 and 3×8 are saying different things.

Howie Hua

166,657 views • 8 months ago

It's Mental Math Monday! If 40% of my number is 20, how would you mentally calculate 70% of my number?
0:22
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It's Mental Math Monday! If 40% of my number is 20, how would you mentally calculate 70% of my number?

Howie Hua

15,436 views • 17 days ago

Why is 0!=1?
2:02
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Why is 0!=1?

Howie Hua

327,460 views • 2 years ago

If it takes Elmo 6 minutes to build a snowman and Rocco 7 minutes to build a snowman, how fast can they build a snowman if they worked together?
1:14
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If it takes Elmo 6 minutes to build a snowman and Rocco 7 minutes to build a snowman, how fast can they build a snowman if they worked together?

Howie Hua

124,758 views • 9 months ago

Today's date, 9/25/2025, is probably the last date of our lifetime where the month, day, and year are all square numbers 😱 Next time this will happen is 1/1/2116.
1:33
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Today's date, 9/25/2025, is probably the last date of our lifetime where the month, day, and year are all square numbers 😱 Next time this will happen is 1/1/2116.

Howie Hua

148,210 views • 11 months ago

One of the coolest math facts that I know is that the only circle that fits perfectly in a 3-4-5 right triangle has an area of pi. Here's how we can prove this.
2:20
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One of the coolest math facts that I know is that the only circle that fits perfectly in a 3-4-5 right triangle has an area of pi. Here's how we can prove this.

Howie Hua

110,607 views • 8 months ago

If chicken nuggets only came in boxes of 5 and 18, what is the largest order not possible? Let's learn about the Chicken McNugget theorem.
1:56
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If chicken nuggets only came in boxes of 5 and 18, what is the largest order not possible? Let's learn about the Chicken McNugget theorem.

Howie Hua

50,686 views • 3 months ago

Did you know you can subtract left to right?
1:51
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Did you know you can subtract left to right?

Howie Hua

90,921 views • 7 months ago

I have two shuffled 52 card decks. If I reveal one card from each deck at the same time and I exhaust the decks, what's the probability of flipping the same exact card at least once?
2:59
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I have two shuffled 52 card decks. If I reveal one card from each deck at the same time and I exhaust the decks, what's the probability of flipping the same exact card at least once?

Howie Hua

42,180 views • 3 months ago