The World of Numbers

Natural numbers are the counting numbers

Natural numbers are the counting numbers {1, 2, 3, 4, ...}. They arose from the need to count objects using one-to-one correspondence. They are closed

The Lebombo Bone has 29 notches

The Lebombo Bone has 29 notches and dates back about 35,000 years. The Ishango bone dates to around 20,000 BCE and has three columns of notches, inclu

Zero became a formal operational number

Zero became a formal operational number through Brahmagupta in 628 CE in the Brāhmasphuṭasiddhānta. Its philosophical background came from śhūnyatā, t

Integers are the set {

Integers are the set {..., -2, -1, 0, 1, 2, ...}. They include positive numbers, negative numbers, and zero. Brahmagupta described positives as fortun

The basic rules are a +

The basic rules are a + 0 = a, a - 0 = a, and a × 0 = 0. Integer rules include 5 + 4 = 9, (-5) + (-4) = -9, (-3) × 4 = -12, and (-3) × (-4) = 12.