When you multiply by 1 the answer stays the same. 21 × 1 = 21 When you multiply by 10, move all the digits one place to the left, putting a zero in the empty space. 21 × 10 = 210 When you ...
The conversation in the lobby, which occurred sometime in the early-to-mid 1960s, sparked both men's imaginations and ultimately gave birth to their 1969 best-seller The Peter Principle ...