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Howie Hua

@howie_hua • 100,673 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?

2,164,172 Aufrufe

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?

79,645 Aufrufe

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?

80,170 Aufrufe

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 _____?

298,060 Aufrufe

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?

243,125 Aufrufe

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 Aufrufe

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

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

946,063 Aufrufe

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

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

12,653 Aufrufe

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

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

385,135 Aufrufe

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

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

314,624 Aufrufe

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?

15,341 Aufrufe

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

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

258,748 Aufrufe

It's Mental Math Monday! How would you mentally calculate 2×2×3×4×5×5?

It's Mental Math Monday! How would you mentally calculate 2×2×3×4×5×5?

12,125 Aufrufe

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?

49,921 Aufrufe

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 ___?

136,516 Aufrufe

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 Aufrufe

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?

180,183 Aufrufe

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 Aufrufe

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

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

41,153 Aufrufe

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 Aufrufe

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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!

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!

228,020 Aufrufe • vor 2 Monaten

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

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

284,968 Aufrufe • vor 2 Monaten

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).

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).

347,155 Aufrufe • vor 6 Monaten

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.

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.

160,821 Aufrufe • vor 2 Monaten

Which is greater: 2025²⁰²⁶ or 2026²⁰²⁵?

Which is greater: 2025²⁰²⁶ or 2026²⁰²⁵?

308,366 Aufrufe • vor 7 Monaten

The decimal representation for 1/7s is really cool

The decimal representation for 1/7s is really cool

134,803 Aufrufe • vor 3 Monaten

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.

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.

95,846 Aufrufe • vor 2 Monaten

Will this answer surprise you? Or is it intuitive?

Will this answer surprise you? Or is it intuitive?

462,774 Aufrufe • vor 1 Jahr

$This fraction comparison strategy is underrated$

This fraction comparison strategy is underrated

20,861 Aufrufe • vor 18 Tagen

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

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

166,572 Aufrufe • vor 6 Monaten

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.

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.

50,480 Aufrufe • vor 2 Monaten

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?

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?

42,171 Aufrufe • vor 1 Monat

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?

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?

124,758 Aufrufe • vor 7 Monaten

Fun math trick: Here's how we can mentally calculate cube roots

Fun math trick: Here's how we can mentally calculate cube roots

17,230 Aufrufe • vor 22 Tagen

Why is 0!=1?

Why is 0!=1?

327,446 Aufrufe • vor 2 Jahren

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.

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.

148,121 Aufrufe • vor 9 Monaten

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.

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.

110,466 Aufrufe • vor 7 Monaten

Did you know you can subtract left to right?

Did you know you can subtract left to right?

90,867 Aufrufe • vor 5 Monaten

$Did you know we can divide across fractions? 😱$

Did you know we can divide across fractions? 😱

89,930 Aufrufe • vor 7 Monaten

Can we all share a fun math fact we will never use in our life but we still think is cool?

Can we all share a fun math fact we will never use in our life but we still think is cool?

87,119 Aufrufe • vor 7 Monaten