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Tham khảo tài liệu 'success step english 3', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Seven Success Steps for Rounding Questions 1. Locate the place. If the question calls for rounding to the nearest ten look at the tens place. Notice the place digit. Realize that the place digit will either stay the same or go up one. 2. Look at the digit to the right of the place digit the right-hand neighbor. 3. If the right-hand neighbor is less than 5 the place digit stays the same. 4. If the right-hand neighbor is 5 or more the place digit goes up one. 5. If the place digit is 9 and the right-hand neighbor is 5 or more then turn the place digit to 0 and raise the left-hand neighbor up one. 6. If instead of a place the question calls for rounding to a certain number of significant digits count that number of digits starting from the left to reach the place digit. Now start with step 1. 7. If the specified place was to the left of the decimal point change all the digits to 0 that are to the right of the place digit. 3. The digit is 9 the 9 will either stay 9 or go to 0. The number 6 is to the right of 9 it is more than 5 so change 9 to 0 and apply step 5 raising the 2 to the left of 9 to 3. Now apply step 7 and change digits to the right of the tens place to 0. The answer is 300. 4. Here you need to apply step 6. Two places from the left is the ten thousands digit a 4. Now apply step 1 and work through the steps The digit is 4 so it will either stay 4 or go up to 5. Since the right-hand neighbor is 5 change the 4 to 5. Now apply step 7 and change all digits to the right of your new 5 to zero. The answer is 350 000. Estimation Estimation requires rounding numbers before adding subtracting multiplying or dividing. If you are given numerical answers you might just want to multiply the two numbers without estimation and pick the answer that is the closest. Most likely however the problem will be more complicated than that. Sample Estimation Question 5. 42 X 57 is closest to a. 45 X 60. b. 40 X 55. c. 40 X 50. d. 40 X 60. e. 45 X 50. Answer to Sample Estimation .
