Estimates concerning the Chou Pei Suan Ching, generally considered to be the oldest of the mathematical classics, differ by almost a thousand years.

Estimates of the total number of Afrikaans-speakers range between 15 and 23 million.

Estimates of the number of people around the world who speak Bulgarian fluently range from about 9 million to 12 million.

Estimates of the total number of Protestants are very uncertain, partly because of the difficulty in determining which denominations should be placed in these categories, but it seems clear that Protestantism is the second largest major group of Christians after Catholicism in number of followers ( although the Orthodox Church is larger than any single Protestant denomination ).

Estimates of the number of major mass extinctions in the last 540 million years range from as few as five to more than twenty.

Estimates of the amount of effort required to build Maeshowe vary ; a commonly suggested number is 39, 000 man-hours, although Colin Renfrew calculated that at least 100, 000 hours would be required.

Estimates of the number of marchers, most of whom were men, ranged from 400, 000 to nearly 1. 1 million, making it the largest gathering of its kind in United States history.

Estimates range as high as two million people, but more recent studies place that number closer to 200, 000.

Estimates for the number of Taoists worldwide range from twenty million and possibly to as many as 400 million in China alone.

Estimates of the number of prostitutes in London in the 1850s vary widely ( in his landmark study, Prostitution, William Acton reported that the police estimated there were 8, 600 in London alone in 1857 ).

Estimates vary about the number and quality of financial jobs in the city.

Estimates vary widely as to the number of gay men imprisoned in concentration camps during the Holocaust, ranging from 5, 000 to 15, 000, many of whom died.

Estimates of the number of Arabs displaced from their original homes, villages, and neighborhoods during the period from December 1947 to January 1949 range from about 520, 000 to about 1, 000, 000 ; there is general consensus, however, that the actual number was more than 600, 000 and likely exceeded 700, 000.

Estimates of the number of speakers vary: the 1996 census reported 160, 000,

Estimates of the number of Haredim globally are difficult to measure, due to its imprecise definition, lack of data collection and rapid change over time.

Estimates on the number of DF-11s in service vary between 500 to 600.

Estimates of the number vary from 30 to 300.

Estimates for the pre-contact native population in California have been based on a number of different sources ( and therefore vary substantially ), but indigenous peoples may have numbered as high as 300, 000, divided into more than 100 separate tribes or nations.

Estimates put the number of casualties between 200 and 1000.

" Estimates of its membership in 1944 range from 200, 000 to 600, 000, with the most common number being 400, 000 ; that figure would make it not only the largest Polish underground resistance movement but one of the three largest in Europe during World War II.

Estimates of the total number killed at Babi Yar during the Nazi occupation vary.

Estimates vary as to the number of Mexican raiders who attacked the soldiers, anywhere from 60 to several hundred.

Estimates of the number of different plant species in the park place the figure at 500.

Estimates of the total number of Cambodians living in the city of Lowell range from 11, 000 to 25, 000-35, 000.

Estimates of enlistments throughout the war were 1, 227, 890 to 1, 406, 180.

Starting in 1948 and continuing throughout the Korean War, Davidson was chief, Plans and Estimates Branch, in General Douglas MacArthur's intelligence office.

Estimates from the 1990s put world membership between 120, 000 and 600, 000.

Estimates of her net worth ranged from $ 100 million to $ 200 million ( or $ 1. 9 – $ 3. 8 billion in 2006 dollars ) ( Slack estimates $ 200 million ), arguably making her the richest woman in the world at the time.

Estimates of infection in the world population vary from a minimum of a billion humans to as many as 5 or 6 billion.

Estimates indicate that there are at least 43, 500 Kota speakers in the world, of whom 34, 442 people ( 79 %) live in the Ogouee-Ivindo province of northeastern Gabon, and 9055 people ( 21 %) in neighboring Congo-Brazzaville.

However, the 1947 yearbook states: " Estimates of the world Jewish population have been assembled by the American Jewish Joint Distribution Committee ( except for the United States and Canada ) and are probably the most authentic available at the present time.

Estimates of the number of Passivhaus buildings around the world in late 2008 ranged from 15, 000 to 20, 000 structures.

Estimates on the number of passive houses around the world range from 15, 000 to 20, 000.

Estimates of French losses range from 2, 000 to 5, 000, with a suggested median point of 3, 500 which includes over a thousand captured wounded and nearly 2, 000 killed, half of which died on Orient.

Estimates for the Ethiopian forces under Menelik range from a low of 73, 000 to a high of over 120, 000, outnumbering the Italians by an estimated five or six times.

Estimates of Esperanto speakers range from 10, 000 to 2, 000, 000 active or fluent speakers, as well as perhaps a thousand native speakers, that is, people who learned Esperanto from birth as one of their native languages.

Estimates of the death toll by mid-December range from 83 reported by the Mutare City Council, based on a request for burial ground, to 140 estimated by the ( then ) opposition Movement for Democratic Change-Tsvangirai party.

Estimates range from about two million ( 2, 000, 000 ) years ago, during the time of Homo habilis, to as recently as forty thousand ( 40, 000 ) years ago, during the time of Cro-Magnon man.

Estimates for total sarin production by Nazi Germany range from 500 kg to 10 tons.

Estimates of the energy of the blast range from 5 to as high as 30 megatons of TNT ( 21 – 130 PJ ), with the most likely — roughly equal to the United States ' Castle Bravo thermonuclear bomb tested on March 1, 1954 ; about 1, 000 times more powerful than the atomic bomb dropped on Hiroshima, Japan ; and about one-third the power of the Tsar Bomba, the largest nuclear weapon ever detonated.

Estimates of Ottoman civilian casualties range from 2, 000, 000 to 2, 150, 000.

Estimates of their album sales generally range from 150 million to 300 million albums, making them one of the world's best-selling music artists.

Estimates of Al-Qaeda and Taliban casualties range from 100 to 1, 000, with U. S. commanders favoring the higher estimates and Afghan commanders favoring the lower estimates.

Estimates of Jewish survivors in Poland range from 40, 000-50, 000 to 100, 000-120, 000.

Estimates range up to 30, 000 speakers.

Estimates of the death toll range between 16, 000 and 40, 000.

Map of the Belgian Congo ( 1884 ) Estimates of the death toll range from two million to fifteen million.

Estimates for total sarin production by Nazi Germany range from 500 kg to 10 tons.

Estimates of Indonesian deaths in fighting range from 45, 000 to 100, 000 and civilian casualties exceeded 25, 000 and may have been as high as 100, 000.

Estimates of the death toll range from 18 million to 45 million, with estimates by demographic specialists ranging from 18 million to 32. 5 million.

Estimates of its original mass range from 800 to 1600 times the mass of our Sun, implying still larger numbers of individual stars.