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On paper, it’s one of the simplest math problems in the world: 2+2. If you’re counting something, like screws at the hardware store, it’s pretty straightforward. But the lines blur in other contexts.

Children who count on their fingers between ages 4 and 6 1/2 have better addition skills by age 7 than those who don’t use their fingers, suggesting that finger counting is an important stepping stone ...

Susan Sonnenschein received a small grant from the Psychology Department at UMBC for some of the research discussed in this article . Rebecca Dowling and Shari Renee Metzger do not work for, consult, ...