The 2,300-year-old matrix is the world's oldest decimal multiplication table. From a few fragments out of a collection of 23-century-old bamboo strips, historians have pieced together what they ...

How It Works. It looks a lot like a modern multiplication table. The top row and the far-right column contain the same 19 numbers: 0.5, the integers 1 through 9, and multiples of 10 from 10 to 90.

Learn how to multiply decimals by 10, 100 and 1000 using a place value chart. Divide up to 4 digits by 1 digit Learn how to break down a calculation when dividing a 4-digit number by a 1-digit number.