2 Improved formatting edited Feb 3 '13 at 4:10 ctype.h 4,02311 gold badge2020 silver badges4343 bronze badges Part of the answer to this depends on whether you are learning the American versus British English variant. In British English, one would say `````` That cake had one hundred calories in it `````` That cake had one hundred calories in it In American English, one would more typically say `````` That cake had a hundred calories in it `````` That cake had a hundred calories in it Additionally there are other differences between how numbers are stated in British versus American English that often cause confusion for new learners: `````` This bicycle cost two thousand, one hundred thirty seven dollars `````` This bicycle cost two thousand, one hundred thirty seven dollars Would be a valid American englishEnglish number -, i.e. \$2137, whereas in British English one would preferentially use the form `````` This bicycle cost two thousand, one hundred **and** thirty seven pounds. `````` This bicycle cost two thousand, one hundred and thirty seven pounds. Meaning the same number - £2137. In both American and British English, you need to qualify the number with "a" or "one" when stating an exactitude, for example `````` This book has hundred pages `````` This book has hundred pages Is wrong in both American and British English. However, you can use the plural form of the quantity without "a" or "one" for indefinite quantities to express an order of magnitude: `````` This book has hundreds of pages `````` This book has hundreds of pages Which would be used either idiomatically to mean `````` This book has lots of pages `````` This book has lots of pages Or precisely to mean that the book has somewhere between 100-999 pages. Part of the answer to this depends on whether you are learning the American versus British English variant. In British English, one would say `````` That cake had one hundred calories in it `````` In American English, one would more typically say `````` That cake had a hundred calories in it `````` Additionally there are other differences between how numbers are stated in British versus American English that often cause confusion for new learners: `````` This bicycle cost two thousand, one hundred thirty seven dollars `````` Would be a valid American english number - i.e. \$2137, whereas in British English one would preferentially use the form `````` This bicycle cost two thousand, one hundred **and** thirty seven pounds. `````` Meaning the same number - £2137. In both American and British English, you need to qualify the number with "a" or "one" when stating an exactitude, for example `````` This book has hundred pages `````` Is wrong in both American and British English. However, you can use the plural form of the quantity without "a" or "one" for indefinite quantities to express an order of magnitude: `````` This book has hundreds of pages `````` Which would be used either idiomatically to mean `````` This book has lots of pages `````` Or precisely to mean that the book has somewhere between 100-999 pages. Part of the answer to this depends on whether you are learning the American versus British English variant. In British English, one would say That cake had one hundred calories in it In American English, one would more typically say That cake had a hundred calories in it Additionally there are other differences between how numbers are stated in British versus American English that often cause confusion for new learners: This bicycle cost two thousand, one hundred thirty seven dollars Would be a valid American English number, i.e. \$2137, whereas in British English one would preferentially use the form This bicycle cost two thousand, one hundred and thirty seven pounds. Meaning the same number - £2137. In both American and British English, you need to qualify the number with "a" or "one" when stating an exactitude, for example This book has hundred pages Is wrong in both American and British English. However, you can use the plural form of the quantity without "a" or "one" for indefinite quantities to express an order of magnitude: This book has hundreds of pages Which would be used either idiomatically to mean This book has lots of pages Or precisely to mean that the book has somewhere between 100-999 pages. 1 answered Feb 3 '13 at 3:23 Matt 11.5k11 gold badge2424 silver badges4949 bronze badges Part of the answer to this depends on whether you are learning the American versus British English variant. In British English, one would say `````` That cake had one hundred calories in it `````` In American English, one would more typically say `````` That cake had a hundred calories in it `````` Additionally there are other differences between how numbers are stated in British versus American English that often cause confusion for new learners: `````` This bicycle cost two thousand, one hundred thirty seven dollars `````` Would be a valid American english number - i.e. \$2137, whereas in British English one would preferentially use the form `````` This bicycle cost two thousand, one hundred **and** thirty seven pounds. `````` Meaning the same number - £2137. In both American and British English, you need to qualify the number with "a" or "one" when stating an exactitude, for example `````` This book has hundred pages `````` Is wrong in both American and British English. However, you can use the plural form of the quantity without "a" or "one" for indefinite quantities to express an order of magnitude: `````` This book has hundreds of pages `````` Which would be used either idiomatically to mean `````` This book has lots of pages `````` Or precisely to mean that the book has somewhere between 100-999 pages.