TAILIEUCHUNG - SAT math essentials part 4

Tham khảo tài liệu 'sat math essentials part 4', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | NUMBERS AND OPERATIONS REVIEW Subtracting When subtracting integers change all subtraction to addition and change the sign of the number being subtracted to its opposite. Then follow the rules for addition. Examples 12 - 15 12 -15 -3 -6 - -9 -6 9 3 Practice Question Which of the following expressions is equal to 9 a. -17 12 - -4 - -10 b. 13 - -7 - 36 - -8 c. -8 X -2 - 14 -11 d. -10 X 4 - -5 X 5 - 6 e. -48 -3 - 28 4 Answer c. Answer choice a 17 12 4 10 9 Answer choice b 13 7 36 8 8 Answer choice c 8 X 2 14 11 9 Answer choice d 10 X 4 5 X 5 6 21 Answer choice e 48 3 28 4 9 Therefore answer choice c is equal to 9. Decimals Memorize the order of place value 3 7 5 9 1 6 0 4 T H T O D T H T T H U E N E E U H E O N N E C N N O N U D S S I T D U T S R M H R S H A E A S E A O N D L D N U D S P T D S S O H T A I S H N N S D T T H S 55 -------------------------- NUMBERS AND OPERATIONS REVIEW --------------------------------------- The number shown in the place value chart can also be expressed in expanded form 3 3 X 1 000 7 X 100 5 X 10 9 X 1 1 X 6 X 0 X 4 X Comparing Decimals When comparing decimals less than one line up the decimal points and fill in any zeroes needed to have an equal number of digits in each number. Example Compare and . Line up decimal points and add zeroes . Then ignore the decimal point and ask which is greater 800 or 8 800 is bigger than 8 so is greater than . Practice Question Which of the following inequalities is true a. b. c. d. e. Answer d. Answer choice a because 40 4. Therefore . This answer choice is FALSE. Answer choice b because 170 17. Therefore . This answer choice is FALSE. Answer choice c because 83 80. This answer choice is FALSE. Answer choice d because 29 30. Therefore . This answer choice is TRUE. Answer choice e because 50 8. Therefore .

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