Why Do Numbers Feel Different to Us?

Some numbers feel familiar, and others don't. Think about it, the number 10 feels friendly because we use base-10 for counting (like our fingers). But 7 might seem a little weird because you can’t split it evenly with most other numbers. In fact, 1, 2, and 5 feel really simple to us because they’re used in daily life, like dividing things or telling time.