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Howie Hua

@howie_hua • 100,784 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! 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?

79,740 Aufrufe

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?

2,163,778 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 _____?

297,819 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?

242,401 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?

946,035 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?

385,131 Aufrufe

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

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

314,614 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?

49,873 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?

258,744 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 ___?

136,513 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?

41,144 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?

180,241 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?

180,179 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?

168,490 Aufrufe

It's Mental Math Monday! If 7.5 is 30% of my number, how would you figure out what my number is?

It's Mental Math Monday! If 7.5 is 30% of my number, how would you figure out what my number is?

14,572 Aufrufe

It's Mental Math Monday! How would you mentally calculate 8+10+12+14+16?

It's Mental Math Monday! How would you mentally calculate 8+10+12+14+16?

23,414 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

It's Mental Math Monday with sixth grade teacher Camden from North Dakota. How would you mentally calculate 25×16?

It's Mental Math Monday with sixth grade teacher Camden from North Dakota. How would you mentally calculate 25×16?

15,644 Aufrufe

It's Mental Math Monday! How would you mentally calculate 81-39?

It's Mental Math Monday! How would you mentally calculate 81-39?

17,975 Aufrufe

Can you solve this math riddle by Eli: What number with one syllable has the highest value?

Can you solve this math riddle by Eli: What number with one syllable has the highest value?

70,553 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!

227,035 Aufrufe • vor 15 Tagen

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?

284,509 Aufrufe • vor 1 Monat

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?

41,763 Aufrufe • vor 6 Tagen

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.

160,551 Aufrufe • vor 1 Monat

The decimal representation for 1/7s is really cool

The decimal representation for 1/7s is really cool

134,563 Aufrufe • vor 1 Monat

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).

346,852 Aufrufe • vor 4 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.

95,594 Aufrufe • vor 1 Monat

Which is greater: 2025²⁰²⁶ or 2026²⁰²⁵?

Which is greater: 2025²⁰²⁶ or 2026²⁰²⁵?

308,278 Aufrufe • vor 5 Monaten

Here's a cool pattern: If we divide the first n positive odd numbers by the next n positive odd numbers, we will always get 1/3. Here's why this makes sense.

Here's a cool pattern: If we divide the first n positive odd numbers by the next n positive odd numbers, we will always get 1/3. Here's why this makes sense.

15,660 Aufrufe • vor 11 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.

166,504 Aufrufe • vor 5 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

My response to "Why do you keep drawing so much? Just teach them the formula!"

My response to "Why do you keep drawing so much? Just teach them the formula!"

11,003 Aufrufe • vor 8 Tagen

Can you draw this Poké ball without retracing or lifting your pen?

Can you draw this Poké ball without retracing or lifting your pen?

23,385 Aufrufe • vor 22 Tagen

What is this math homework asking for?

What is this math homework asking for?

41,670 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?

124,756 Aufrufe • vor 6 Monaten

Did you know you can subtract left to right?

Did you know you can subtract left to right?

90,672 Aufrufe • vor 4 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.

110,092 Aufrufe • vor 5 Monaten

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.

148,084 Aufrufe • vor 8 Monaten

Why does a negative divided by a negative equal a positive? Why does a negative divided by a positive equal a negative? Here's how I would explain it to a 7th grader.

Why does a negative divided by a negative equal a positive? Why does a negative divided by a positive equal a negative? Here's how I would explain it to a 7th grader.

51,056 Aufrufe • vor 2 Monaten

Why is 0!=1?

Why is 0!=1?

327,413 Aufrufe • vor 1 Jahr