Transcript Rounding Lesson - Growth Mindset Maths

LO Round numbers
RAG
Key Words: Decimal Place, Significant Figure.
11-Apr-16
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
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
Main Task
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)
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?