English Unlimited HTL 1, Schulbuch mit Audio-CD und CD-ROM

71 Work and leisure 06 LANGUAGE SKILLS EXPLORE LOOK AGAIN EXTRAS Operation What you say 1 a + b = c a plus b is / equals c the sum of a plus b is c one number is added to another one 2 a ļ b = c a minus b is / equals c c is the difference between a and b one number is subtracted from another one 3 a × b = c a multiplied by b is / equals c a times b is / equals c c is the product of a and b 4 a ÷ b = c a divided by b is / equals c 5 x over y; x all over y plus seven x is the numerator , and y is the denominator one half ; one fourth / quarter ; one third ; two thirds 6 a to the power of n; two squared four cubed ; ten to the power of six the n th root of x; the square root of four the cube root of twenty-seven 8 3 × [2 ÷ (4 ļ 2)] = 3 x < y y > x a ʼn b b Ŋ a c Ň d three times square bracket two divided by bracket four minus two bracket square bracket equals three x is less than y y is greater than x a is less than or equal to b b is greater than or equal to a c is approximately equal to d 6WXG\ WKH FKDUW DQG FRPSOHWH LW ZLWK WKH ZRUGV IURP WKH ER[ Division Multiplication Subtraction Fractions Addition Raising to a power Special cases Extracting the root Special cases Order of operations in a calculation First do any sum in brackets, then divisions and multiplications, lastly additions and subtractions. Example: 5 + 4 × 3 = ´ Multiplication comes before addition, so 17 is correct. Example: 2 × (8 ļ 4) = ´ First calculate the bracket, then do the multiplication. So the correct answer is 8. Or: first you solve the bracket by subtracting 4 from 8 and then you multiply the result by 2. Info point: Calculating 27 x y ; y + 7 x 1 ; 2 1 ; 4 1 ; 3 2 3 a n 4 3 2 2 10 6 ; ; ń4 n ńx ; 3 ń27 Nur zu u z Prüfzwecken – Eigentum des Verlags öbv