Clinical signs are usually seen 3-5 days after exposure. Second-generation coumarins and indandiones are toxic with a single dose. Second-generation coumarins are a greater hazard than first-generation coumarins if the dog or cat eats a poisoned rat or mouse.
Quick Answer. Fractions were created by the ancient Egyptians in 1800 B.C. Egyptians created a number system on a base 10 concept, which is similar to the numerical systems used in the United States and around the world for creating fractions. Originally, Egyptians used pictures as well as numerals to display and differentiate numbers.
Decimal fractions are fractions where the denominator is a power of ten. There is an alternative way to write a decimal fraction. Notice that the the decimal place is moved to the left the same number of digits as number of zeros in the denominator. Tenths, Hundredths, Thousandths, Ten-Thousandths, etc.