Starter%20Activity

1
LO Round numbers RAG
Key Words Decimal Place, Significant Figure. 19-Jun-19
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 344
5 7981
9
Main Task
10
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)
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?