Year 4 Negative Numbers Reasoning and Problem Solving
[Pages:5]Reasoning and Problem Solving Step 13: Negative Numbers
National Curriculum Objectives:
Mathematics Year 4: (4N5) Count backwards through zero to include negative numbers Mathematics Year 4: (4N6) Solve number and practical problems that involve 4N1 - 4N5 and with increasingly large positive numbers
Differentiation:
Questions 1, 4 and 7 (Problem Solving) Developing Determine which sequence of numbers is incorrect. Using knowledge of positive and negative numbers to -10. Including number lines and thermometers with single increments and some varied scales, all values marked. Expected Determine which sequence of numbers is incorrect. Using knowledge of positive and negative numbers to -25. Including number lines and thermometers with varied increments and some missing values. Greater Depth Determine which sequence of numbers is incorrect. Using knowledge of positive and negative numbers to -25. Including number lines and thermometers with some values given and where some numbers fall between increments.
Questions 2, 5 and 8 (Problem Solving) Developing Use statements to find a missing number. Using knowledge of positive and negative numbers to -10. Including number lines and thermometers with single increments and some varied scales, all values marked. Expected Use statements to find a missing number. Using knowledge of positive and negative numbers to -25. Including number lines and thermometers with varied increments and some missing values. Greater Depth Use statements to find a missing number. Using knowledge of positive and negative numbers to -25. Including number lines and thermometers with some values given and where some numbers fall between increments.
Questions 3, 6 and 9 (Reasoning) Developing Compare two temperatures using knowledge of positive and negative numbers to -10. Including number lines and thermometers with single increments and some varied scales, all values marked. Expected Compare two temperatures using knowledge of positive and negative numbers to 25. Including number lines and thermometers with varied increments and some missing values. Greater Depth Compare two temperatures using knowledge of positive and negative numbers to -25. Using knowledge of positive and negative numbers to -25. Including number lines and thermometers with some values given and where some numbers fall between increments.
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Reasoning and Problem Solving ? Negative Numbers ? Teaching Information
Negative Numbers
1a. Three children are counting using number lines.
Negative Numbers
1b. Three children are counting using number lines.
Blossom -8 -7 -6 -5 -4 -3 -2 -1
Kobi -10 -9 -8 -7 -6 -5 -4 3
Reuben -7 -6 -5 -4 -3 -2 -1 1
Mia -2 -1 0 1 2 3 4 5
Anai -3 -2 -1 0 1 2 3 4
Are they correct? Explain how you know.
Harry -5 -4 -3 -2 -1 0 1 2
Are they correct? Explain how you know.
D
R
D
R
2a. What's my number?
2b. What's my number?
My number is between 0 and -4. It is an odd number. It is not -3.
Use the number line to help you.
My number is between -5 and -9. It is an even number. It is not -6.
Use the number line to help you.
-4
-3
-2
-1
0 -9
-8
-7
-6
-5
D
PS
D
PS
3a. Which city is cooler? Explain how you 3b. Which city is cooler? Explain how you
know.
know.
8oC 7oC 6oC 5oC 4oC 3oC 2oC 1oC 0oC -1oC -2oC
18oC 16oC 14oC 12oC 10oC 8oC 6oC 4oC 2oC 0oC -2oC
0oC -1oC -2oC -3oC -4oC -5oC -6oC -7oC -8oC -9oC -10oC
19oC 17oC 15oC 13oC 11oC 9oC 7oC 5oC 3oC 1oC -1oC
Venice
D
Boston
R
D
Kingston
London
R
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Reasoning and Problem Solving ? Negative Numbers ? Year 4 Developing
Negative Numbers
4a. Three children are counting in sequences using number lines.
Negative Numbers
4b. Three children are counting in sequences using number lines.
Anna -25 -20 -15 -10 -5 0 5 10
Ted -11 -9 -7 -5 -3 -1 -2 -3
Pete -20
0
20
40
Jon -10
0
10
20
Dot -25 -20 -15 -10 -5 0 1 6
Are they correct? Explain how you know.
Mara -6 -4 -2 0 2 4 6 8
Are they correct? Explain how you know.
E
R
E
R
5a. What's my number?
5b. What's my number?
My number is between 5 and -10. It is an even number.
It is a negative number. It is closer to zero than it is to -5.
My number is between -5 and -20. It is a multiple of 5.
It is a negative number less than -10. It is an odd number.
Use the number line to help you.
Use the number line to help you.
-9 -7 -5 -3 -1 1 3 5
-20 -18 -16 -14 -12 -10 -8 -6
E
PS
E
PS
6a. Which city is cooler? Explain how you 6b. Which city is cooler? Explain how you
know.
know.
-2oC -6oC -10oC -14oC -18oC -22oC
4oC 0oC -4oC -8oC -12oC
14oC 10oC 6oC 2oC -2oC
-4oC -8oC -12oC -16oC -20oC -24oC
Toronto
E
Aberdeen
R
E
Oslo
Ottawa
R
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Reasoning and Problem Solving ? Negative Numbers ? Year 4 Expected
Negative Numbers
7a. Three children are counting in sequences using number lines.
Negative Numbers
7b. Three children are counting in sequences using number lines.
Alfie -21
-12
0
8
Mara
-20
-10
5
15
Kobi -25
-15
-5
5
Alyssa 50
20
-10
Mia
-4
0
4
8
Anai
-13
-9
-5
-1
Are they correct? Explain how you know. Are they correct? Explain how you know.
GD
R
GD
R
8a. What's my number?
8b. What's my number?
My number is a negative number. It is between -10 and -20. It is an odd number. It is a multiple of 5.
My number is between 5 and -15. It is a negative number. It is an even number. It is 15 less than 5.
Use the number line to help you.
Use the number line to help you.
-20
-10 -15
5
GD
PS
GD
PS
9a. Which city is cooler? Explain how you 9b. Which city is cooler? Explain how you
know.
know.
21oC 17oC 13oC 9oC 5oC 1oC
-4oC -8oC -12oC -16oC -20oC -24oC
0oC -4oC -8oC -12oC -16oC
2oC -2oC -6oC -10oC -14oC -18oC
Munich
GD
Fairbanks
R
GD
Banff
Bergen
R
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Reasoning and Problem Solving ? Negative Numbers ? Year 4 Greater Depth
Reasoning and Problem Solving Negative Numbers
Developing 1a. Reuben is incorrect because he has not counted forward one from -1. 2a. -1 3a. Boston because -2?C is less than 1?C
Expected 4a. Dot is incorrect because she has not counted back five from 1. 5a. -2 6a. Toronto because -16?C is less than 2?C
Greater Depth 7a. Alfie is incorrect because he has not counted back four from 16. 8a. -15 9a. Fairbanks because -23?C is less than 2?C
Reasoning and Problem Solving Negative Numbers
Developing 1b. Kobi is incorrect because he has not counted forward one from -4. 2b. -8 3b. Kingston because -7?C is less than 5?C
Expected 4b. Ted is incorrect because he has not counted back two from -1. 5b. -15 6b. Ottawa because -6?C is less than -4?C
Greater Depth 7b. Mara is incorrect because she has not counted forwards five from -5. 8b. -10 9b. Banff because -14?C is less than 1?C
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Reasoning and Problem Solving ? Negative Numbers ANSWERS
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