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Transcript
E xpressing N um bers and Operations in E nglish 1. Numbers 1 2 3 4 5 6 7 8 9 10 one two three four five six seven eight nine ten 11 12 13 14 15 16 17 18 19 20 Cardinal numbers from 1 through 1 000 000 eleven 21 twenty-one 31 twelve 22 twenty-two 40 thirteen 23 twenty-three 50 fourteen 24 twenty-four 60 fifteen 25 twenty-five 70 sixteen 26 twenty-six 80 seventeen 27 twenty-seven 90 eighteen 28 twenty-eight 100 nineteen 29 twenty-nine 1 000 twenty 30 thirty 1 000 000 thirty-one forty fifty sixty seventy eighty ninety one hundred one thousand one million Examples: 305 three hundred and five 754 1 507 seven hundred and fifty-four one thousand, five hundred and seven 2 328 1 800 two thousand, three hundred and twenty-eight one thousand, eight hundred or eighteen hundred 1 436 209 one million, four hundred thirty-six thousand, two hundred and nine 2 700 400 two million, seven hundred thousand, four hundred (NOTE: The British use and before the last two figures, but the Americans usually leave the and out). The number 0: Nought (UK English) Zero (US English) Oh (like the letter O): used when reading out numbers figure by figure (e.g. telephone numbers, credit card numbers, etc). 1 E xpressing N um bers and O perations - 3 o E SO 2 Decimal numbers: In English we use a full stop (.) instead of a comma (,) to separate the main part of a number from the decimal part: 0.1 nought point one (UK) or 0.75 1.263 nought point seven five (UK) one point two six three zero point one (US) or zero point seven five (US) You can use a comma (,) in large numbers to separate the hundreds, thousands, and millions. For example, 5,074 means five thousand and seventy four. In UK English, spaces are sometimes used instead of commas (5 074). Place value: In our decimal number system, the value of each digit depends on its place in the number. Each place is 10 times the value of the next place to its right. Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Units Tenths Hundredths Thousandths Ten Thousandths 1 000 000 100 000 10 000 1 000 100 10 1 0.1 0.01 0.001 0.0001 Ordinal numbers: 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th first second third fourth fifth sixth seventh eighth ninth tenth 11th 12th 13th 14th 15th 16th 17th 18th 19th 20th Ordinal numbers from 1 through 1 000 000 eleventh 21st twenty-first 31st twelfth 22nd twenty-second 40th thirteenth 23rd twenty-third 50th fourteenth 24th twenty-fourth 60th fifteenth 25th twenty-fifth 70th sixteenth 26th twenty-sixth 80th seventeenth 27th twenty-seventh 90th eighteenth 28th twenty-eighth 100th nineteenth 29th twenty-ninth 1 000th twentieth 30th thirtieth 1 000 000th D pto. M atemáticas. IES Jovellanos. 2011 thirty-first fortieth fiftieth sixtieth seventieth eightieth ninetieth one hundredth one thousandth one millionth E xpressing N um bers and O perations - 3 o E SO 3 2. Operations Operation symbols + plus − × or · minus times / or : divided by = 6 = equals or is equal to is not equal to < > is less than is greater than ≤ ≥ is less than or equal to is greater than or equal to Addition (to add): 2+3 =5 Two plus three equals five The answer is called the sum or total. Subtraction (to subtract): 7−3 =4 Seven minus three equals four The answer is called the difference. Multiplication (to multiply): 5 · 3 = 15 Five times three equals fifteen or Five multiplied by three. . . The answer is called the product. Division (to divide): 8:2=4 9 2 1 4 Eight divided by two equals four 9: 2: 4: 1: dividend divisor quotient remainder ✁✃✁✃✁✃✁✃✁✃✁✃✁✃ D pto. M atemáticas. IES Jovellanos. 2011