Students in Melissa Williams' kindergarten class at the Westminster School in Atlanta, Georgia, practice connecting quantities to written numbers — a key part of number sense. Credit: Holly Korbey for ...

Knowing how precisely a high school freshman can estimate the number of objects in a group gives you a good idea how well he has done in math as far back as kindergarten. Knowing how precisely a high ...

Having a poor "gut sense" of numbers can lead to a mathematical learning disability and difficulty in achieving basic math proficiency. This inaccurate number sense is just one cause of math learning ...

Brian Butterworth is on a crusade to understand the number deficit called dyscalculia — and to help those who have it. In the mid-1980s, Paul Moorcraft, then a war correspondent, journeyed with a film ...