I've been doing a podcast of math problems, and the feedback so far is: give us more difficult problems! You asked, I'll deliver. I hope you like them. Coming Sunday morning as always... Free 30-minute parent consultNot sure where to start?Tell us what’s going on...
In the eight-term sequence "a, b, c, d, e, f, g, h", c represents 5, and the sum of any three consecutive terms is 30. What’s a+h? (Spiciness: ** out of ****) Free 30-minute parent consultNot sure where to start?Tell us what’s going on with your student and we’ll...
We’re going to play a simple coin-flip game. We take turns flipping a fair coin. The first one to get “heads” wins. You go first. // What’s your chance of winning? // Spiciness: *** out of **** Free 30-minute parent consultNot sure where to start?Tell us what’s going...
A friend of mine has pictures of his three daughters on his mantle. He took the pictures when each of the girls was a particularly adorable age — the same age for all three of them, as it happens. Unfortunately, this made it impossible for me to determine which was...
Kiana has two older twin brothers. The product of their three ages is 128. What is the sum of their three ages? // Spiciness: * out of **** // (Today’s puzzler comes from the 2009 AMC 10 exam. Learn more at dtmath.com/amc.) Free 30-minute parent consultNot sure where...
You have just tested positive for a condition known to affect 1% of the population. However, your doctor assures you that the test for this condition is only 90% accurate. You’re not sure whether that’s supposed to make you feel better or not. So, you tell me:...