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Whole Number Arithmetic

Whole Number Arithmetic. Rounding and estimating. 621.8 19.02 57.04 98.63 1.03 610.8 519.6. 622 19 57 99 1 611 520. Round to the nearest whole number. 19.023 57.046 81.774 89.522 1.03 2.59 49.97. 19.0 57.0 81.8 89.5 1.0 2.6 50.0. Round to one decimal place. 1.902

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Whole Number Arithmetic

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  1. Whole Number Arithmetic Rounding and estimating

  2. 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520 Round to the nearest whole number

  3. 19.023 57.046 81.774 89.522 1.03 2.59 49.97 19.0 57.0 81.8 89.5 1.0 2.6 50.0 Round to one decimal place

  4. 1.902 5.704 0.1036 2.974 0.006 3.899 0.003 1.90 5.70 0.10 2.97 0.01 3.90 0.00 Round to two decimal places

  5. The reading 4.1 kg, has two significant figures.

  6. The width of the footpath is 1.81m (to the nearest cm)

  7. How many significant figures? The width of the footpath is 1.81m (to the nearest cm)

  8. Complete this table

  9. Complete this table

  10. 7.56 2.7 4.6 10.6 8 3 5 10 Round to one significant figure

  11. 9.6 2.5 55.1 1.26 22.4 178.3 8.75 3.24 2 2 3 3 3 4 3 3 How many significant figures?

  12. 46.81 3.808 4.077 71.08 83.881 778.049 4 4 4 4 5 6 How many significant figures?

  13. 400.00 40.0 1.4 1.40 1.400 10.0 1.50 100.00 5 3 2 3 4 3 3 5 How many significant figures?

  14. The length of this pencil is 83 mm to the nearest mm. • 83 mm has been rounded to two significant figures. • 83 mm = 0.083 m • 0.083 m also has two significant figures.

  15. 0.061 0.007 0.00061 0.46 0.070 0.0700 0.0074 0.07006 2 1 2 2 2 3 2 4 How many significant figures?

  16. Exercise 9 Rounding

  17. Waikato Clutha Wanganui Taieri Rangitiki Waitaki 425 322 290 288 241 209 Round the lengths of N. Z. Rivers to the nearest 10 Km.

  18. Waikato Clutha Wanganui Taieri Rangitiki Waitaki 425 = 430 322 = 320 290 = 290 288 = 290 241 = 240 209 = 210 Round the lengths of N. Z. Rivers to the nearest 10 Km.

  19. Cook Tasman Ruapehu Taranaki Ngauruhoe Tongariro 3764 3498 2797 2518 2291 1968 Round the heights of N. Z. Mountains to the nearest 100 m.

  20. Cook Tasman Ruapehu Taranaki Ngauruhoe Tongariro 3764 = 3800 3498 = 3500 2797 = 2800 2518 = 2500 2291 = 2300 1968 = 2000 Round the heights of N. Z. Mountains to the nearest 100 m.

  21. Taupo Te Anau Wakatipu Wanaka Manapouri Hawea 60 606 34 447 29 267 19 166 14 245 11 914 Round the areas of N. Z. Lakes to the nearest 1000 ha.

  22. Taupo Te Anau Wakatipu Wanaka Manapouri Hawea 60 606 = 61 000 34 447 = 34 000 29 267 = 29 000 19 166 = 19 000 14 245 = 14 000 11 914 = 12 000 Round the areas of N. Z. Lakes to the nearest 1000 ha.

  23. Northland Auckland Waikato Bay of Plenty Gisborne Hawkes' Bay Taranaki Manawatu - Wanganui Wellington 13 941 5 600 25 598 12 447 8 351 14 164 7 273 22 215 8 124 Round the areas of N. Z. Regions correct to 2 significant figures.

  24. Northland Auckland Waikato Bay of Plenty Gisborne Hawkes' Bay Taranaki Manawatu - Wanganui Wellington 13 941 = 14 000 5 600 = 5 600 25 598 = 26 000 12 447 = 12 000 8 351 = 8 400 14 164 = 14 000 7 273 = 7 300 22 215 = 22 000 8 124 = 8 100 Round the areas of N. Z. Regions correct to 2 significant figures.

  25. Nelson Tasman Marlborough West Coast Canterbury Otago Southland New Zealand 40 279 37 973 38 397 32 512 468 040 185 083 97 100 3 618 302 Round the population of N. Z. Regions correct to 3 significant figures.

  26. Nelson Tasman Marlborough West Coast Canterbury Otago Southland New Zealand 40 279 = 40 300 37 973 = 38 000 38 397 = 38 400 32 512 = 32 500 468 040 = 468 000 185 083 = 185 000 97 100 = 97 100 3 618 302 = 3 620 000 Round the population of N. Z. Regions correct to 3 significant figures.

  27. This table shows the population of Auckland's 4 cities rounded to the nearest 1000. Copy down and complete the table.

  28. This table shows the population of Auckland's 4 cities rounded to the nearest 1000. Copy down and complete the table.

  29. Exercise 10 Approximate Calculations

  30. a. 90 x 6 b. 90 x 60 c. 900 x 60 d. 900 x 600 540 5400 54 000 540 000 Oral examples - 1

  31. a. 80 x 5 b. 80 x 50 c. 800 x 50 d. 800 x 500 400 4000 40 000 400 000 Oral examples - 2

  32. = 50 Oral examples - 3

  33. = 50 Oral examples - 3

  34. = 500 Oral examples - 3

  35. = 500 Oral examples - 3

  36. = 200 Oral examples - 4

  37. = 200 Oral examples - 4

  38. = 2000 Oral examples - 4

  39. = 2000 Oral examples - 4

  40. 80 x 7 2. 80 x 70 3. 800 x 70 4. 800 x700 560 5600 56 000 560 000 Written examples

  41. 5. 40 x 5 6. 40 x 50 7. 400 x 50 8. 400 x 500 200 2000 20 000 200 000 Written examples

  42. = 50 9.

  43. = 50 10.

  44. = 500 11.

  45. = 500 12.

  46. = 200 13.

  47. = 20 14.

  48. = 2000 15.

  49. = 2000 16.

  50. Estimation Answers are not exact

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