NEW YORK When IBM client executive Rachel Calhoun negotiates multimillion-dollar contracts with clients, she needs to crunch numbers swiftly in her head because face-to-face meetings rarely allow time to whip out a calculator.

Kumon students complete worksheets at their own speed, regardless of their grade level.
NEW YORK When IBM client executive Rachel Calhoun negotiates multimillion-dollar contracts with clients, she needs to crunch numbers swiftly in her head because face-to-face meetings rarely allow time to whip out a calculator.