7BOBO-dHHHHHH-`H--X@ -L -Z(`}@xHH(FG(HH(d'@-  l `/A +.-x-ݨP+.UUU<-@H- 9v -ߠ!4 SDSET-D-p-tj-(,hj,hj'"+,st!"&'`aefjkPQcd!"f  R8KLPR9wx  YZ # $ H I L M 8 9 ; * E F  +    % +           2-P-H-߈-߀ -߄READING GUIDE UNIT 2 ESTIMATING ANSWERS 1. Most of the time if you _______________ a problem by thinking of a _______________ answer, you can usually recognize a _______________ you might make later in your calculations. 2. List two situation where close answers are OKAY. a. b. 3. List two situations where exact answers are required. a. b. 4. An _______________ answer is one that is close to the true answer. 5. How rough is a rough estimate? That depends on the _______________. 6. Most of the time it is easier to do problems with numbers like _____, _____, _____ and _____. 7. The cutting off method of estimating is called _______________. 8. Name the decimal places to the left of the decimal point. _____ _____ _____ _____. STEPS TO ROUNDING CORRECTLY 9. STEP 1 - _______________ _______________ _______________ in the place to which you want to round 10. STEP 2 - _______________ My final answer is going to have zeros in all the places to the right of the underlined digit. 11. STEP 3 - _______________ _______________ _______________ pointing to the digit just to the right of the underlined digit. 12. If the digit with the arrow is _______________ than five add one to the underlined digit. If the digit with the arrow is _______________ than five dont change the underlined digit. 13. _______________ all circled digits with zeros. 14. If the digit with the arrow is 5, _______________ one to the underlined digit. 15. Round and truncate the following numbers. NUMBER ROUND TRUNCATE 758 (to 100s) _______________ _______________ 85 (to 10s) _______________ _______________ 2365 (to 1000s) _______________ _______________ 432 (to 100s) _______________ _______________ 16. If adding one to nine in the rounding process gives you a _______________, just write a zero and add one to the next place to the left. 17. Name the following columns to the right of the decimal point. . _____ _____ _____ 18. The little _______________ makes a big difference. 19. To get a more accurate answer, when you are using a calculator to work a problem, do all calculations _______________ - _______________ rounding - then _______________ the final answer. 20. When working a problem in your head - without a calculator - it makes sense to round the numbers _______________. 21. You should make a rough estimation of the size of the final answer before / after you start to work a problem. (circle one) 22. Estimates should be fast and _______________. 23. If you have more than three numbers, you may want to round half of them _______________ and half of them _______________. HOW TO MAKE A ROUGH ESTIMATE 24. First, look for numbers that are close to _____ or _____ or _____. Then round the other numbers in the way that is easiest for you. If you round one number up, try rounding the next number down. That keeps your estimate closer to the true answer. 25. Second, _______________ the problem with your rounded numbers. 26. Third, work the restated problem and write an estimated answer. Include the _______________ appropriate on the answer (pounds, miles, years, or whatever). 27. Finally, _______________ and then _______________ your final answer to the estimate you made at the beginning. If they are very different, estimate again and redo your work. 28. Before you work the problem, ask yourself What kind of answer to this problem makes _______________?. 29. After you work the problem ask yourself Is my answer _______________ in this real situation? DSET|(H-4=T9 6*=T9DSET(H-@9y9?z?6*=9DSETR -܈-|--   -ܐUnit 2 reading guideDSETR@-p-t-`   -݈