Starter Activity Think pair share I have £240

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Presentation transcript:

Starter Activity Think pair share I have £240 LO Round numbers RAG Key Words: Decimal Place, Significant Figure. 20-Apr-17 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?

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.

7656.548

5243.568

1657.899

0.0000456

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 Print this slide and the next slide two slides to a page.

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 Print this slide and the previous slide, two slides to a page.

Main Task Print this slide and the next slide two slides to a page.

Tick one answer and trash the other. Main Task Jill Tick one answer and trash the other. Rounding Jack 3.5 (1dp) 3.56 to 1 dp 3.6 (1dp) 0.4 0.416 to 1 dp 0.4 (1dp) 0.41 (2dp) 0.416 to 2 dp 0.42 (2dp) 5.79 (2dp) 5.799 to 2 dp 5.8 (2dp) 4 (1sf) 3.56 to 1 s.f. 3.6 (1sf) 0 (1sf) 0.416 to 1 s.f 0.4 (1sf) 0.42 (2sf) 0.416 to 2 s.f. 0.4 (2sf) 5.8 (2sf) 5.799 to 2 s.f. 5.79 (2sf) Print this slide and the previous slide two slides to a page.

Extension Task

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

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?