ROUNDING OFF NUMBERS
- 1. MATH TIME Week 1 Day 4
- 2. DRILL
- 3. Read the following numbers. 18 453 9 009 370 5 702 045 4 901 067
- 4. Guessing Game All pupils will solve the given problemas fast as they can. The first pupil who will give the correct answer wins. a. My ones digit is 2. My tens digit is twice the ones digit. My hundreds digit is thrice the ones digit and my thousands digit is the sumof the ones and the tens digit. What numberamI? b. I ama 6-digit number. My thousands digit is 9. My ten thousands digit is 4.My hundred thousands digit is 3. My hundreds digit is 2.My ones digit is 7. The otherdigits is zero. Who amI?
- 5. REVIEW
- 6. A. If we skip count by 100s 1 238 is nearer to 1 200 than 1 300. 4 299 is nearer to ____ than ______. 5 478 is nearer to ____ than ______. 6 872 is nearer to ____ than ______. 2 879 is nearer to ____ than ______. 4 590 is nearer to ____ than ______.
- 7. B. If we skip count by 1 000s 41 238 is nearer to 41 000 than 42 000. 52 299 is nearer to ______ than ______. 75 475 is nearer to ______ than ______. 16 872 is nearer to ______ than ______. 32 479 is nearer to ______ than ______. 47 590 is nearer to ______ than ______.
- 8. MOTIVATION
- 10. PRESENTATION
- 11. How will you solve the problem?
- 13. To what numberis 22 950 closer? 20 000 or 30 000? Since it is closerto 20 000, round it down. Find 25 800. Where is it located? Lookat the numberline. Examine. Lead pupils to answer the problemby asking: Which is 25 800 closer to? Study the numberline.
- 14. When do we round up and when do we round down?
- 15. Group Activity Complete the table. MONEY Roundtothe Nearest TenThousands HundredThousands Millions Php 5 016575 Php 7867570 Php 1 265420 Php 8704765 Php 3897543
- 17. When do we round up and when do we round down?
- 19. Round off the following numbers to the indicated place value. Nearest Thousands 1) 78 125 _________________ 2) 51 789 _________________ 3) 25 507 _________________ 4) 6 895 _________________ 5) 27 023
- 20. Round off the following numbers to the indicated place value. Nearest Ten Thousands 1) 781 000 _________________ 2) 2 342 670 _________________ 3) 54 671 _________________ 4) 63 421 _________________ 5) 241 584
- 21. Round off the following numbers to the indicated place value. Nearest Hundred Thousands 1) 8 562 902 _________________ 2) 5 124 900 _________________ 3) 12 578 124 _________________ 4) 9 876 540 _________________ 5) 567 810
- 22. Round off the following numbers to the indicated place value. Nearest Millions 1) 14 568 140 _________________ 2) 29 128 035 _________________ 3) 50 671 904 _________________ 4) 47 132 090 _________________ 5) 1 452 907
- 24. “How do we round numbers? To round off a whole numberto a specified place value, determine the digit to the right of the place you are rounding off to. If the digit is 5,6,7,8,and 9, round it up orsimply add 1 to the digit in the specified place and replace the digits to the right with zeros. If the digit is less than 5 (4,3,2,1,and 0)retain the digits in the specified place and replace/change the digits to the right with zeros
- 27. ASSESSMENT
- 28. Round to the highest place value. 1. 24 567 __________________ 2. 129 467 __________________ 3. 72 560 458 __________________ 4. 4 670 138 __________________ 5. 2 453 760 435 __________________ 6. 4 125 902 567 __________________ 7. 136 786 __________________ 8. 34 089 457 __________________ 9. 5 246 790 653 __________________ 10. 198 134 __________________
- 29. HOME ACTIVITY
- 30. Encircle the numbers that can be rounded to the given numbers. 1) 3 200 000 3 234 567 3 256 418 3 178 982 3 214 675 3 265 109 2) 47 000 000 46 864 125 47 432 160 47 876 523 47 082 971 46 087 542 3) 2 000 000 000 2 123 456 789 2 564 768 980 2 098 765 432 1 765 000 982 1 980 701 673
- 31. Enrichme nt
- 32. The following are the land areas in square kilometres of some Asian countries. Round off each area to one- digit accuracy. Example: 685 rounded to one-digit accuracy is 700. 1. Indonesia : 1 919 443 ________________________ 2. Philippines : 300 076 ________________________ 3. Singapore : 618 ________________________ 4. Malaysia : 131 587 ________________________ 5. Brunei : 5 765 ________________________ 6. Japan : 377 801 ________________________ 7. Thailand : 513 998 ________________________ 8. Kampuchea : 181 035 ________________________