1. Type your name and send:
Rounding
LO: Understand how to round numbers to the nearest 10, whole number or decimal place.
Type your name and send:
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2. Starter – order decimals
Discuss?
Which value is the bigger?
4.17km
0.84
0.325
0.345
0.72
11.7
7.30cm
11.57
7.03cm
4.162km
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3. Starter – order decimals
Discuss?
Put these in order, smallest first.
0.213
0.231
0.132
0.123
0.312
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4. What is the value…
3.4
Answer =
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5. What is the value…
5.2
Answer =
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6. 4.8 What is the value… 3 4 5 Answer =
4.8
Answer =
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How do you know when to round up or down?

7. Round the following number to 1dp
If this number is a 0, 1, 2, 3 or 4 we don’t have to do anything else and we have our answer.
Now look at the number immediately after where we stopped highlighting
6.348
Firstly, highlight the number to the first number after the decimal point
So we have 6.3
But is this the answer?
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8. Round the following number to 1dp
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9. What if the red number was a 5, 6, 7, 8 or 9?
Lets look at an example
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10. Round the following number to 1dp
If this number is a 5, 6, 7, 8 or 9 we increase the last digit by one.
Now look at the number immediately after where we stopped highlighting
9.2721
Firstly, highlight the number to the first number after the decimal point
So we have 9.2
But is this the answer?
So 9.2 becomes 9.3
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11. Round the following number to 1dp
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12. Rounding to the nearest whole number
Is the arrow nearer to 6, 7 or 8?
If it is halfway between, then round UP
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13. Round these city populations to the nearest million
Mexico City million
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14. Round these city populations to the nearest million
Mexico City million
Sao Paulo million
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15. Round these city populations to the nearest million
Mexico City million
Sao Paulo million
Tokyo million
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16. Round these city populations to the nearest million
Mexico City million
Sao Paulo million
Tokyo million
New York million
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17. Rounding to the nearest 10
Is the arrow nearer to 20, 30 or 40?
If it is halfway between, then round UP
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18. What is the volume of liquid to the nearest 10 millilitres?
100 90 80 70 60 50 40 30 20
10ml
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19. What is the volume of liquid to the nearest 10 millilitres
100 90 80 70 60 50 40 30 20
10ml
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20. What is the volume of liquid to the nearest 10 millilitres
100 90 80 70 60 50 40 30 20
10ml
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21. Rounding to the nearest 100
Is the arrow nearer to 400 or 500?
If it is halfway between, then round UP
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22. What is the mass of flour to the nearest 100g?
200
400
600
grams
Discuss?
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Estimate the value to the nearest 10g

23. What is the mass of flour to the nearest 100g?
200
400
600
grams
Discuss?
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Estimate the value to the nearest 10g

24. What is the mass of flour to the nearest 100g?
200
400
600
grams
Discuss?
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Estimate the value to the nearest 10g

25. Rounding to 1 decimal place
What value is the arrow pointing at?
Is it nearer to 1.4 or 1.5?
Discuss?
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26. Rounding heights & distances
Round each of these winning heights & distances to the nearest whole number
Round them to one decimal place (1 d.p.)
Women’s events
High Jump
2.09 m
Long Jump
7.48 m
Shot-put
21.95 m
Discus
76.80 m
Javelin
80.00 m
Discuss?
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27. Take Care! 3.5 3 (not 4) Round 3.48 to 1 d.p
Round 3.48 to the nearest whole number
3 (not 4)
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28. LO: rounding numbers to decimal places
I need more practice to help me understand this and I made lots of mistakes. B
I am beginning to understand this and I got many of them correct. C
I really understand this and I got most of them correct.
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