Adding and Subtracting Negative numbers Number skills Calculate using mental and written methods Negative numbers Bronze Yr 4 Silver Yr 5 Gold Yr 6 Platinum Yr 7 Yr 8 Yr 9 ID: 492607
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Slide1
Negative Numbers
Adding and Subtracting Negative numbersSlide2
Number skills
-
Calculate using mental and written methods
-
Negative
numbers
Bronze
Yr 4
Silver
Yr 5
Gold
Yr 6
Platinum
Yr 7
Yr 8
Yr 9
Identify negative whole numbers on a number line
Order 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 Slide3
Vocabulary
Never heard it
Heard it but not sure
Know it and can give examples about itnumber linenegative numberspositive numbersfour operationsmental methodwritten method
Name:
Never heard it before word grid:Slide4
(–8) – (–3)
(+8) – (+3)
(+3) – (+8)
(–3) + (+8)(–8) + (–3)(+8) – (–3)Copy the questions and write the answers into your bookChoose two of the questions and explain your answers below using words or diagrams or both.Slide5Slide6Slide7
Why is this
‘
4
’?4Slide8
How much is this?Slide9
Making 3
Show me three more ways of making 3.
Can you do one using 11 charges altogether?Slide10
How much is this?Slide11
How much is this?
–2Slide12
How much is this?Slide13
How much is this?
0Slide14
How much is this?Slide15
How much is this?
+3Slide16
How would you describe what happens here?Slide17
How would you describe what happens here?Slide18
How would you describe what happens here?
(+4) +Slide19
How would you describe what happens here?
(+4) + (-2) =Slide20
How would you describe what happens here?
(+4) + (-2) = +2Slide21
What about this?
+2Slide22
What about this?
What do we get when we take away a negative?Slide23
What about this?
(+2) - Slide24
What about this?
(+2) – (–1) = Slide25
What about this?
(+2) – (–1) = (+3)Slide26
Another exampleSlide27
Another example
+1Slide28
Another example
(+1) – (–2) Slide29
Another example
(+1) – (–2) = +3 Slide30
Number skills
-
Calculate using mental and written methods
- Negative numbersBronze /SilverGoldPlatinumYr 8Yr 9Identify negative whole numbers on a number lineOrder whole numbers between -10 and 10Order negative and positive numbers, including decimals to 1 decimal placeAdd 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 ÷Slide31
Working together 1
Choose one of the three cards and match it with one of the calculations.
Write the answer to the calculation after the equals sign.
Check that the answer matches what you see in the drawing.Do the same with the other two cards.Make up drawings to fit the remaining three calculations and write down the answers to those three calculations.The answers should match the drawings.Everyone in the group should agree.Slide32Slide33Slide34
Calculations (1)Slide35
How can I draw (+2) – (+5)?Slide36
How can I draw (+2) – (+5)?
Another way of thinking of (+2)…Slide37
How can I draw (+2) – (+5)?
And another...Slide38
How can I draw (+2) – (+5)?
And another...
Do you agree that this is still (+2)?Slide39
How can I draw (+2) – (+5)?
How can I take away (+5)?Slide40
How can I draw (+2) – (+5)?
(+2) – (+5) =Slide41
How can I draw (+2) – (+5)?
(+2) – (+5) = (-3)Slide42
Number skills
-
Calculate using mental and written methods
- Negative numbersBronze /SilverGoldPlatinumYr 8Yr 9Identify negative whole numbers on a number lineOrder whole numbers between -10 and 10Order negative and positive numbers, including decimals to 1 decimal placeAdd 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.Slide43
Working together 2
Choose one of the three cards and match it with one of the calculations.
Write the answer to the calculation after the equals sign.
Check that the answer matches what you see in the drawing.Do the same with the other two cards.Make up drawings to fit the remaining three calculations and write down the answers to those three calculations.The answers should match the drawings.Everyone in the group should agree.Slide44Slide45
Calculations (2)Slide46