Ryan Dougherty

@Amypbarrett @brainingcamp It is three trapezoids, just turned and placed together. Make one, the copy, copy, copy.

@brainingcamp Where do you access the cubes for volume. i am looking in the pattern block manipulatives and don’t see them.

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Love the use of lines and how they can help students see the greater/less than sign.

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@howie_hua @MikeFlynn55 Divide each by 2. My new problem is 44 x 4 x 2 x 2. 44 x 4 = 176 (40 x 4) + (4 x 4) 2 x 2 = 4 176 x 4 = 704 But I guess I ended up using an 8 when multiplying 70 x 4. Hope it still counts.

It's Mental Math Monday with @MikeFlynn55. How would you mentally calculate 88×8 without using any 8s?

@howie_hua @pwharris I broke 15 into 10 and 5. 10 x 36 = 360 (Full circle) 5 x 36 = 180 (Half circle) From watching the Olympics, I know a 1.5 rotation is called a 540, and 360 + 180 = 540

It's Mental Math Monday! Pam Harris from Math is Figureoutable @pwharris wants to know how you would mentally calculate 15×36. Please share how you would do it in the comments.

@howie_hua I started at 73. Subtracted 3 to get 70. Subtracted 30 to get 40. Then subtracted 4 to get 36. Breaking the 37 into more manageable numbers makes the subtraction easier for me.

It's Mental Math Monday with guest Ramon from Spain. How would you mentally calculate 73-37?

@howie_hua @mminas8 I broke the 27 into 25 + 2. Seeing the 25 made me think of money. 8 X 25 = 8 quarters = $2.00 8 X 2 = 16 pennies = $0.16 $2.00 + $0.16 = $2.16 8 x 27 = 216

It's Mental Math Monday! Michael Minas @mminas8 from Australia wants to know how you would mentally calculate 8×27. Please share how you would do it.

@howie_hua Flip the problem - What is 50% of 30? Half of a number is easier for me. Half of 30 is 15. I used the model on the right, but then double checked with the original one on the left.

It's Mental Math Monday with math educator Cory from Minnesota. How would you mentally calculate 30% of 50?

@howie_hua 2 ways. 1st - I was born in 1974, so they are 2 years younger than me. I'm 51, they are or will be 49. 2nd - On a number line. 2025 - 50 is 1975. I subtracted 1 too many. Add the -1 back and I also get 49. (number line not to scale)

It's Mental Math Monday! How would you mentally calculate someone's age at the end of 2025 if they were born in 1976?

@howie_hua I added all the tens first to get 40. I was left with 3+5+7+9. 3+7= 10 (add that to my 10's group to now have 50) 5+9= 14 (another ten to get 60) 60 + 4 = 64

It's Mental Math Monday! How would you mentally calculate 13+15+17+19?

@howie_hua Traveling 6 miles in 5 min. means you will go 36 miles in 30 min. Traveling 7 miles in 6 min. means you will go 35 miles in 30 min. 6 miles in 5 minutes is just a bit faster.

It's Mental Math Monday! How would you mentally calculate which is faster: going 6 miles in 5 minutes or going 7 miles in 6 minutes?

@howie_hua First thought - it is just less than 20 if I didn't need to be exact. Second thought - reverse the numbers - 40% of 45. 10% of 45 is 4.5. I need four of those. 4.5 + 4.5 + 4.5 + 4.5 = 18. (Solved this as 9 + 9 or (4x4) + 2)

It's Mental Math Monday! What goes on in your head when you're mentally calculating 45% of 40?

Step into a fresh new era! ✨ The NEW Brainingcamp interface is now more intuitive, accessible, and classroom-ready than ever! Now available in all 18 manipulatives.

@howie_hua Using your numbers, and estimating my height in cm. (I'm between 6' 4" and 6' 5" - but where exactly, I'm not sure and don't really care.) I'm about 196 cm. So I would have about $280. All the little difference in exact height might add or remove a dollar, but I'll take it!

Would you rather have $200 or a stack of quarters as tall as you? (Redo since I made a mistake in the last video 🙁 )

@howie_hua But playing around with the linking cubes, I found another interesting way.

@howie_hua First way I saw it was -- 6+9 = 15 7+8 = 15 15+15 = 30

It's Mental Math Monday! How would you mentally calculate 6+7+8+9?

@howie_hua I subtracted 50 instead of 45. I knew I subtracted too much, so I added 5 back. 112-45 = 112-50+5 67

It's Mental Math Monday! What goes on in your head when you're mentally calculating 112-45?

@howie_hua Knowing 7.5% x 250 is the same as 250% of 7.5, I am going to find double and half of 7.5. I know 100% of 7.5 = 7.5. Double - 200% of 7.5 = 15 Half - 50% of 7.5 = 3.75 Using those numbers to find 250% - 15+ 3.75 = 18.75

It's Mental Math Monday! How would you mentally calculate 7.5% of 250?