1. 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?

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.

7. Support Task
Round these numbers to the nearest 10 and position them to the nearest 10 on the number line below.
Print this slide and the next slide two slides to a page.

8. Round these numbers to the nearest 100 and position them to the nearest 10 on the number line below.
Round these numbers to the nearest 100 and position them to the nearest 10 on the number line below.
Print this slide and the previous slide, two slides to a page.

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

10. 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.

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 when rounded to the nearest
1 000.
Questions B
What is the smallest number that is rounded to 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?