© T Madas

© T Madas Before we learn how to add and subtract negative numbers let us use the postman example: He delivers: cheques (positive) bills (negative) If they have been posted to us by mistake he can also take them back.

© T Madas One day he delivers a £5 cheque and a £3 bill. We are £2 better off. £5£ = 5 3–=2

© T Madas Another day he delivers a £5 cheque and takes away a £6 cheque. We are £1 worse off. £5£6 – –= 5 6–=

© T Madas Another day he delivers a £4 cheque and takes away a £3 bill. We are £7 better off. £4£3 – –= 4 3+=7

© T Madas Another day he delivers a £6 cheque and a £4 cheque. We are £10 better off. £6£ = 6 4+=10

© T Madas He takes away a £5 cheque and brings a £4 cheque. We are £1 worse off. £5£ = 4+= -

© T Madas He takes away a £2 cheque and brings a £2 bill. We are £4 worse off. £ = 2–=-4 -

© T Madas He takes away a £5 cheque and a £7 bill. We are £2 better off. £5£7 – - 5-7–= =2 -

© T Madas – –+ + –– – +–

© T Madas What is 5 add -3 ? + ––

© T Madas What is 5 subtract +6 ? – +–

© T Madas What is 4 subtract -3 ? – –+

© T Madas What is 6 add +4 ? + ++

© T Madas What is -5 add +4 ? + ++

© T Madas What is -2 subtract +2 ? – +–

© T Madas What is -5 subtract -7 ? – –+

© T Madas 5 add +4 5 subtract -4 5 add -4 5 subtract – –+ + –– – +–

© T Madas More Practice On Adding & Subtracting Negative Numbers

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Quick Test On Adding & Subtracting Negative Numbers

© T Madas + ++ – –+ + –– – +–

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