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DCI Matte Black Powder Coated Metal Mathematics Blackboard Pop Quiz Clock, 11-1/2" Diameter

4.3 out of 5 stars 270 customer reviews
| 3 answered questions

Price: $43.39
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  • Each hour is marked by a simple math problem
  • Matte black powder coated metal
  • Requires 1 AA battery
  • 11-1/2" Diameter
7 new from $25.48 4 used from $24.67

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$30.99 & FREE Shipping on orders over $49. Details Only 1 left in stock. Sold by Juvo+ and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

  • DCI Matte Black Powder Coated Metal Mathematics Blackboard Pop Quiz Clock, 11-1/2" Diameter
  • +
  • Math Jokes 4 Mathy Folks
  • +
  • Mathematical Formulas Mug
Total price: $55.43
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WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Description

If you can read this clock, you are without a doubt a geek. Each hour is marked by a simple math problem. Solve it and solve the riddle of time. Matte black powder coated metal. Requires 1 AA battery (not included). 11-1/2" Diameter.

Product Information

Product Dimensions 13 x 12.2 x 2.4 inches
Item Weight 2.5 pounds
Shipping Weight 1.1 pounds (View shipping rates and policies)
Manufacturer American 3B Scientific
ASIN B001FVRUFQ
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Item model number W64701MB
Batteries 1 AA batteries required.
Customer Reviews
4.3 out of 5 stars 270 customer reviews

4.3 out of 5 stars
Best Sellers Rank #39,181 in Home and Kitchen (See Top 100 in Home and Kitchen)
#102 in Home & Kitchen > Home Décor > Clocks > Wall Clocks

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This item: DCI Matte Black Powder Coated Metal Mathematics Blackboard Pop Quiz Clock, 11-1/2" Diameter
Customer Rating 4 out of 5 stars (270) 4 out of 5 stars (188) 4 out of 5 stars (8) 4 out of 5 stars (55)
Price $30.99 $14.95 $39.99 $41.05
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Juvo+ Gifts and Gadgets Online ADV PRO Advertising Since 1997 Hubbub
Color Black Black Blue White
Item Package Weight 1.15 pounds 1 pounds 1.6 pounds 1.3 pounds
Material Metal Wood Aluminum metal
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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By J. M. Timlin on March 19, 2013
Verified Purchase
This clock stoped working after about 6 weeks or so. I wouldnt buy this if I were you. It's cleaver and funny to make people look at math problems; and it seems like it would be made well, but it's not.

***Update*** 4/1/2013 SO i did a little tinkering because I was bored on saturday and had nothing better to do... Turns out this whole thing is an undersized gear problem for the second hand... The gear is just way to small for the size and weight distribution of the second hand... So a simple fix for this, if your clock does what mine did, is to simple trim down the second hand to a size of abotu 3 inches from the base point tot he tip. Seems to be working just fine now. Still only going to give it two stars, as I had to take it apart to make it work
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I have this in my great room above my bay window, the only analog clock in my house.
It's a great novelty item, everyone notices it and gets a kick out of it.
The circle that makes up the face is a thin piece, mounted on the square that houses the battery and mechanical parts behind it, so the circle will not sit flush on a wall. And the mount is in the middle of the top of that smaller square in back, making it tougher to find the right hanging point for mounting it.
Other than that, it works well, keeps pretty good time actually, only has to be adjusted a couple minutes each month.
On quiet nights though when I'm just working on my laptop and nothing is on the TV, you can hear the tick tick tick though, so if you're a person who doesn't like the ticking noise, you won't want this hanging anywhere that gets quiet.
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Verified Purchase
I should have listened to the reviews that warned this clock would come to you broken because that's exactly how I received it. At first I thought that I could fix the hour hand that was loose. Although I was able to secure it, the second hand would stick for several seconds to a full minute before moving again. Cute clock but not functional. What a waste of time. The only good thing is that the company did not give me a hassle about returning it, I guess they knew it was a piece of junk.
1 Comment 14 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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First of all, I love this clock. I got it as a birthday present and it looks great on my wall.

Now, on to the one problem with it. The expression that is supposed to evaluate to 9, which is 3 * (pi - 0.14), actually evaluates to around 9.00477. Pi is irrational, so you can't express a natural number like 9 with an expression containing pi. I'm sure this has driven many other mathematicians insane, and I seem to be the first one to speak up about it.

Other than that slightly anal comment, its a great clock!
12 Comments 25 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
I got this clock it looks cool but just realized that has a huge mistake, a floor function is missing for accuracy.
1 Comment 7 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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I got this as a Christmas gift, and have been very happy with it so far. I put it up at work (computer engineering company) , and I get a lot of compliments from people who like it.

The only things keeping it from 5 stars:
* Somewhat loud, though 95% of the time I don't hear it. It's no louder than any other analog clock, but the distraction is up to how much you can tune that ticking sound out.
* One time it stopped working apparently due to the seconds hand getting stuck behind the minutes hand. I re-bent the seconds hand to be straighter, and then it started up again. No issues since
* Technically the 9 hand is incorrect since pi-.14 is not exactly 3. Since I work at a computer company with all engineers, some people actually point this out and "care". For what it's worth, if you're making a nerd clock, you have to realize there are nerd sensibilities around it.

Update: After a year, it has stopped working. The seconds hand gets stuck and won't move when the clock is upright. Changing batteries had no effect. Disappointed it only lasted a year as other wall clocks I have are going strong after 8 years. Knocked off a star for it, and getting another math clock as a replacement.
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Bought as a gift for my (math enthusiast) boyfriend for his birthday. Read the reviews about the secondhand freezing. Figured like others' reviews with those issues, I'd just be able to adjust the weight of the secondhand if it arrived faulty and unable to keep time correctly. Unfortunately for me, the clock only works if it's laying flat on a surface. When it's hung, the secondhand will rotate and eventually gets stuck at one position or another. Despite several attempts to adjust the weight to balance the secondhand, including the eventual complete removal of the secondhand, I cannot get the clock to keep time. It's my fault for buying a known faulty product but I had such hopes of success after reading others' abilities to resolve the issue of the unbalanced secondhand. At this point I'm just going to have to replace the entire timepiece and use the face of the clock since that's the only reason I purchased it to begin with.
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I love the idea of this clock but after several months, the second hand got stuck on something. Time literally stopped. I couldn't get it to work properly. Save you money. Don't buy this.
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