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

by DCI
| 3 answered questions

List Price: $31.99
Price: $19.50 & FREE Shipping on orders over $35. Details
You Save: $12.49 (39%)
Only 9 left in stock.
Sold by totalElement and Fulfilled by Amazon. Gift-wrap available.
  • Each hour is marked by a simple math problem
  • Matte black powder coated metal
  • Requires 1 AA battery
  • 11-1/2" Diameter
21 new from $19.28 2 used from $16.49

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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
Price for all three: $40.56

Buy the selected items together


WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Special Offers and Product Promotions

  • Buy Used and Save: Buy a Used "DCI Matte Black Powder Coated Metal Mathematics Bl..." and save 48% off the $31.99 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.
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Product Details

  • Product Dimensions: 13 x 12.2 x 2.4 inches ; 1 pounds
  • Shipping Weight: 1.2 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Origin: China
  • ASIN: B001FVRUFQ
  • Item model number: W64701MB
  • Batteries 1 AA batteries required.
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (192 customer reviews)
  • Amazon Best Sellers Rank: #3,901 in Home & Kitchen (See Top 100 in Home & Kitchen)
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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.

Customer Reviews

This is a nice clock and made of a good quality.
Amazon Customer
I have this in my great room above my bay window, the only analog clock in my house.
John S. Dean
I bought this clock as a gift for a math teacher and he LOVED it.
Jen

Most Helpful Customer Reviews

36 of 36 people found the following review helpful By John S. Dean TOP 500 REVIEWER on May 15, 2011
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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28 of 28 people found the following review helpful 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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17 of 20 people found the following review helpful By therealcheesecake on June 10, 2012
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!
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8 of 8 people found the following review helpful By BRENDA THOMPSON on March 13, 2013
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.
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7 of 8 people found the following review helpful By reg TOP 1000 REVIEWER on October 6, 2008
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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4 of 4 people found the following review helpful By ToriGirl on March 27, 2013
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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4 of 4 people found the following review helpful By Arthur on March 6, 2013
Verified Purchase
I got this clock it looks cool but just realized that has a huge mistake, a floor function is missing for accuracy.
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3 of 3 people found the following review helpful By MF on July 11, 2013
Verified Purchase
So far so good!
After three weeks, this clock seems to working fine. It is very cheaply made. Basically, you get what you paid for.
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