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Approximation Skills - Rounding Numbers for Quick Decision Making

Learn to round numbers to make quick decisions on purchasing concert tickets. Practice rounding to the nearest 10, 100, and to 1, 2, or 3 decimal places and significant figures. Explore rounding on number lines and apply your skills to answer questions.

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Approximation Skills - Rounding Numbers for Quick Decision Making

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  1. Starter Activity Think pair share I have £240 I want to buy 13 tickets to a pop concert. The tickets cost £15.50 each. Without working out the exact cost how can I quickly decide if I have enough money?

  2. Mini white boards ready… Get ready to round numbers to the nearest: 10, 100, 1000, to 1, 2 or 3 decimal places to 1, 2 and 3 significant figures.

  3. 7656.548

  4. 5243.568

  5. 1657.899

  6. 0.0000456

  7. Support Task Round these numbers to the nearest 10 and position them to the nearest 10 on the number line below. 27 31 45 58 67 99 5 3 17

  8. Round these numbers to the nearest 100 and position them to the nearest 10 on the number line below. 271 31 456 589 670 990 525 345 79 Round these numbers to the nearest 100 and position them to the nearest 10 on the number line below. 2711 316 4567 5890 6720 9190 5325 3445 7981

  9. Main Task

  10. Main Task

  11. Extension Task

  12. Mini white boards ready… Choose one of the three questions to answer. You must explain your answer.

  13. Plenary Question A Give me a number that is 6 000 when rounded to the nearest 1 000. Questions B What is the smallest number that is rounded to 61.5 when rounded to one decimal place? Question C What is the largest number that is rounded to 700 when rounded to the one significant figure?

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