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

by DCI
4.2 out of 5 stars 258 customer reviews
| 3 answered questions

List Price: $31.99
Price: $29.99 & FREE Shipping on orders over $35. Details
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Sold by FireBall and Fulfilled by Amazon. Gift-wrap available.
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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
4 new from $29.95 2 used from $24.99

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$29.99 & FREE Shipping on orders over $35. Details In Stock. Sold by FireBall 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 Details

  • Product Dimensions: 13 x 12.2 x 2.4 inches ; 1 pounds
  • Shipping Weight: 1.2 pounds (View shipping rates and policies)
  • 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
  • Origin: China
  • ASIN: B001FVRUFQ
  • Item model number: W64701MB
  • Batteries 1 AA batteries required.
  • Average Customer Review: 4.2 out of 5 stars 258 customer reviews
  • Amazon Best Sellers Rank: #27,293 in Home & Kitchen (See Top 100 in Home & Kitchen)
  • Product Warranty: For warranty information about this product, please click here

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Customer Reviews

Top Customer Reviews

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
3 Comments 39 of 39 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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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.
Comment 40 of 42 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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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 13 of 13 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 24 of 28 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 of 7 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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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.
Comment 6 of 6 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
As a former math teacher, I was drawn to this clock! I have purchased it for a former co-worker, who is also a friend, for Christmas. It should be a hit in his room. I was impressed with how quickly this arrived. I ordered Tuesday night and received it before noon on Friday. Since it didn't qualify for Prime, I'm glad it arrived quickly so I feel I got something for having to pay for shipping!
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Verified Purchase
I gave this to one of my best friends. It's kind of like an inside joke, and he loved it. It was completely unexpected. Even his roommates thought it was pretty cool and pretty nerdy. It's a rather simple clock that doesn't look cheap. It's a good novelty product because usually novelty gifts just have poor quality, but this was great.
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