Among two-digit numbers, is 91 the only one that is hard to spot? 91 is not a prime number. 91 = 7 × 13 However, I suspect there are surprisingly few people who can answer that the moment they see it.

Dylan Kane likes his math curriculum. But there’s one important piece missing, he says. The 7th grade math teacher in Leadville, Colo., uses a program that teaches math skills through real-world ...

I will never forget this one day when Kevin was a preschooler. We had an IEP meeting, and one of his proposed math IEP goals was to be able to visualize and identify what 2 of something looks like or ...