Rounding to significant figures - Weebly



Rounding to significant figuresExercise A - Round to 1 significant figure320 = 5. 76= 9. 49.5= 475 = 6. 32654= 10. 0.862= 5500 = 7. 13.7= 11. 99= 2.8= 8. 0.09458= 12. 19500= Exercise B - Round to 2 significant figures825 = 4. 5841= 7. 34821= 2.473 = 5. 261= 8. 5.953= 8.95 = 6. 0.05236= 9. 176.5= Exercise C - Round to 3 significant figures7654 = 3. 25.862= 5. 125640= 128.35= 4. 44.98= 6. 0.054372= Exercise D – Complete the tableNumberRounded to 1 sfRounded to 2 sfRounded to 3 sf1. 23742. 352533. 54994. 568.545. 7.37826. 953.757. 64.958. 80549. 99.872110. 0.349611. 0.200712. 0.006598152746272991You should round each number to 1 significant figure before any calculations are performed00You should round each number to 1 significant figure before any calculations are performedExercise E – Give an approximate answer. 1. 47 x 325. 632 x 2.949. 64 ÷ 0.2313. 368 x 0.682. 280 x 15.86. 18.60.3910. 47.9 + 32.61.75 x 4.3914. 12.7 x 4.350.183. 7.8 ÷ 0.3527. 0.675 x 0.42511. 0.61 ÷ 0.017515. 0.054 x 0.2674. 5.36 + 2.830.4758. 24.7 - 6.350.24512. 43.5 x 5.6334.8 - 9.6716. 84 x 6.3332.5148653558420Remember to show your rounded numbers00Remember to show your rounded numbersRounding to significant figures - answersExercise A - Round to 1 significant figure1. 320 = 3005. 76= 809. 49.5= 502. 475 = 5006. 32654= 3000010. 0.862= 0.93. 5500 = 60007. 13.7= 1011. 99= 1004. 2.8= 38. 0.09458= 0.0912. 19500= 20000Exercise B - Round to 2 significant figures1. 825 = 8304. 5841= 58007. 34821= 350002. 2.473 = 2.55. 261= 2608. 5.953= 6.03. 8.95 = 9.06. 0.05236= 0.0529. 176.5= 180Exercise C - Round to 3 significant figures1. 7654 = 76503. 25.862= 25.95. 125640= 1260002. 128.35= 1284. 44.98= 45.06. 0.054372= 0.0544Exercise D – Complete the tableNumberRounded to 1 sfRounded to 2 sfRounded to 3 sf1. 23742000240023702. 352534000035000353003. 54995000550055004. 568.546005705695. 7.378277.47.386. 953.7510009509547. 64.95606565.08. 80548000810080509. 99.872110010099.910. 0.34960.30.350.35011. 0.20070.20.200.20112. 0.0065980.0070.00660.00660Exercise E – Give an approximate answer. 1. 47 x 325. 632 x 2.949. 64 ÷ 0.2313. 368 x 0.68 50 x 30 = 1500 600 x 3 = 1800 60 ÷ 0.2 = 600 ÷ 2 = 300 400 x 0.7 = 2802. 280 x 15.86. 18.60.3910. 47.9 + 32.61.75 x 4.3914. 12.7 x 4.350.18 300 x 20 = 6000 200.4 = 2004 = 5050 + 302 x 4 = 808 = 1010 x 40.2 = 400.2 = 4002 = 2003. 7.8 ÷ 0.3527. 0.675 x 0.42511. 0.61 ÷ 0.017515. 0.054 x 0.267 8 ÷ 0.4 = 80 ÷ 4 = 20 0.7 x 0.4 = 0.28 0.6 ÷ 0.02 =60 ÷ 2 = 300.05 x 0.3 = 0.0154. 5.36 + 2.830.4758. 24.7 - 6.350.24512. 43.5 x 5.6334.8 - 9.6716. 84 x 6.3332.55 + 30.5 = 80.5 = 805 = 16 or 161 = 1620 - 60.2 = 140.2 = 1402= 7040 x 630 - 10 = 24020 = 1280 x 630 = 48030 = 16 ................
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