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Negative Numbers. Adding and Subtracting Negative numbers. Name: Never heard it before word grid:. (–8) + (–3). (+3) – (+8). (+8) – (+3). (–8) – (–3). (–3) + (+8). Copy the questions and write the answers into your book - PowerPoint PPT Presentation
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Negative Numbers
Adding and Subtracting Negative numbers
Number skills - Calculate using mental and written methods - Negative numbers
Bronze Yr 4
SilverYr 5
GoldYr 6
PlatinumYr 7 Yr 8 Yr 9
Identify negative whole numbers on a number lineOrder whole numbers between -10 and 10
Order negative and positive numbers, including decimals to 1 decimal place
Add or subtract negative or positive numbers using a number line
add and subtract with negative numbers using mental methods
multiply and divide with negative numbers using mental methods
use the four operations in multistep calculations involving negative numbers, using mental and written methods
Vocabulary Never heard it
Heard it but not
sure
Know it and can give examples about it
number line
negative numbers
positive numbers
four operations
mental method
written method
Name:Never heard it before word grid:
(–8) – (–3)(+8) – (+3)
(+3) – (+8)
(–3) + (+8)
(–8) + (–3)
(+8) – (–3)
•Copy the questions and write the answers into your book
•Choose two of the questions and explain your answers below using words or diagrams or both.
Why is this ‘4’?
4
How much is this?
Making 3
Show me three more ways of making 3.
Can you do one using 11 charges altogether?
How much is this?
How much is this?
–2
How much is this?
How much is this?
0
How much is this?
How much is this?
+3
How would you describe what happens here?
How would you describe what happens here?
How would you describe what happens here?
(+4) +
How would you describe what happens here?
(+4) + (-2) =
How would you describe what happens here?
(+4) + (-2) = +2
What about this?
+2
What about this?
What do we get when we take away a negative?
What about this?
(+2) -
What about this?
(+2) – (–1) =
What about this?
(+2) – (–1) = (+3)
Another example
Another example
+1
Another example
(+1) – (–2)
Another example
(+1) – (–2) = +3
Number skills - Calculate using mental and written methods - Negative numbers
Bronze /Silver Gold Platinum Yr 8 Yr 9
Identify negative whole numbers on a number lineOrder whole numbers between -10 and 10
Order negative and positive numbers, including decimals to 1 decimal place
Add or subtract negative or positive numbers using a number line
add and subtract with negative numbers using mental methods
multiply and divide with negative numbers using mental methods
use the four operations in multistep calculations involving negative numbers, using mental and written methods
Use two different coloured counters to help you.
Check your answers with each other on MWB before you decide where each picture goes.
Go through and write your answers in without looking at the diagrams. Then use the cards and draw diagrams to convince someone else in your group that your answers are correct.
Come up with a diagram that uses + and – symbols to explain calculations which use x and ÷
See if you can convince other people in your group that your diagrams work to shoe x and ÷
See if you can convince other people in your group that your diagrams work to shoe x and ÷
Working together 11. Choose one of the three cards and match it with one of the
calculations.
2. Write the answer to the calculation after the equals sign.
3. Check that the answer matches what you see in the drawing.
4. Do the same with the other two cards.
5. Make up drawings to fit the remaining three calculations and write down the answers to those three calculations.
6. The answers should match the drawings.
7. Everyone in the group should agree.
Calculations (1)
How can I draw (+2) – (+5)?
How can I draw (+2) – (+5)?
Another way of thinking of (+2)…
How can I draw (+2) – (+5)?
And another...
How can I draw (+2) – (+5)?
And another...
Do you agree that this is still (+2)?
How can I draw (+2) – (+5)?
How can I take away (+5)?
How can I draw (+2) – (+5)?
(+2) – (+5) =
How can I draw (+2) – (+5)?
(+2) – (+5) = (-3)
Number skills - Calculate using mental and written methods - Negative numbers
Bronze /Silver Gold Platinum Yr 8 Yr 9
Identify negative whole numbers on a number lineOrder whole numbers between -10 and 10
Order negative and positive numbers, including decimals to 1 decimal place
Add or subtract negative or positive numbers using a number line
add and subtract with negative numbers using mental methods
multiply and divide with negative numbers using mental methods
use the four operations in multistep calculations involving negative numbers, using mental and written methods
Use two different coloured counters to help you.
Check your answers with each other on MWB before you decide where each picture goes.
Go through and write your answers in without looking at the diagrams. Then use the cards and draw diagrams to convince someone else in your group that your answers are correct.
Come up with a diagram that uses + and – symbols to explain calculations which use x and ÷
See if you can convince other people in your group that your diagrams work to shoe x and ÷
Choose two different positive integers less than 10. Make a new table showing all the possible addition and subtraction calculations if either number could be positive or negative. Try to work out the answers, use diagrams if you need to.
Working together 21. Choose one of the three cards and match it with one of the
calculations.
2. Write the answer to the calculation after the equals sign.
3. Check that the answer matches what you see in the drawing.
4. Do the same with the other two cards.
5. Make up drawings to fit the remaining three calculations and write down the answers to those three calculations.
6. The answers should match the drawings.
7. Everyone in the group should agree.
Calculations (2)
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