 Negative Numbers Adding and Subtracting Negative numbers.

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Negative Numbers 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 7Yr 8Yr 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

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?

–2

How much is this?

0

+3

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

Another example

+1

Another example (+1) – (–2)

Another example (+1) – (–2) = +3

Working together 1 1.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)?

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)