Decimal system

The American tutor's assistant improved, or, A compendious system of decimal practical arithmetic: comprising the usual methods of calculation with the addition of federal money and other decimals, dispersed though the several rules of that useful science : adapted for the easy and regular instruction of youth in the United States

compiled by Zechariah Jess, schoolmaster in Wilmington.

Math Skills Made Fun: Dazzling Math Line Designs Gr.4-5 (Grades 4-5)

Cindi Mitchell

On Beyond a Million: An Amazing Math Journey

David M. Schwartz

Can you count to a googol?

Robert E. Wells.

The decimal system in numbers, coins, and accounts: especially with reference to the decimalisation of the currency and accountancy of the United Kingdom

by Sir John Bowring.

When There Were Dinosaurs: Using Expanded Notation to Represent Numbers in the Millions

Orli Zuravicky

Can You Count More Than Before? (Math Made Fun)

Tracy Kompelien

Big numbers: and pictures that show just how big they are!

by Edward Packard ; illustrated by Salvatore Murdocca.

Summary of the decimal coinage question

by Professor De Morgan

Key to percents

by Steven Rasmussen and David Rasmussen.