Now can-t you compute these-i -4-5ii -6-9iii -12-10iv -8-7v -3-5-4-5

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Standard VII

Mathematics

Application of Negative Numbers in Everyday Life

Now can't you...

Question

Now can’t you compute these?

(i) −4 − (−5)

(ii) −6 − (−9)

(iii) −12 − (−10)

(iv) −8 − (−7)

(v)

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Solution

We know that for any two positive numbers x and y, we have −x − (−y) = −x + y.

(i) −4 − (−5) = −4 + 5 = 5 − 4= 1

(ii) −6 − (−9) = −6 + 9 = 9 − 6 = 3

(iii) −12 − (−10) = −12 + 10 = 10 − 12 = −2

(iv) −8 − (−7) = −8 + 7 = 7 − 8 = −1

(v)

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Similar questions

Can you now do these?

(i) 4 − 7

(ii) 3 − 9

(iii) 6 − 10

(iv) 2 − 12

(v) 4 − 12

Now can’t you do these?

(i) −3 −1

(ii) −5 −6

(iii) −8 −8

(iv) −12 −18

(v)

Evaluate:
(i) $(- 6) \times (- 15) \times (- 5)$

(ii) $(- 8) \times (- 5) \times 9$

(iii) $9 \times (- 12) \times 10$

(iv) $(- 75) \times 8$

(v) $(- 5) \times (- 5) \times (- 5) \dots \dots$ taken $5$ times

(vi) $(- 1) \times (- 1) \times (- 1) \dots \dots$ taken $25$ times

Now can’t you do these?

(i) −4 + 7

(ii) −3 + 8

(iii) −6 + 9

(iv) −2 + 10

(v) −4 + 12

(vi)

Now can’t you easily do these?

(i) 4 − (−1)

(ii) 6 − (−2)

(iii) 12 − (−8)

(iv) 2 − (−2)

(v)

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Now can’t you compute these? (i) −4 − (−5) (ii) −6 − (−9) (iii) −12 − (−10) (iv) −8 − (−7) (v)

We know that for any two positive numbers x and y, we have −x − (−y) = −x + y. (i) −4 − (−5) = −4 + 5 = 5 − 4= 1 (ii) −6 − (−9) = −6 + 9 = 9 − 6 = 3 (iii) −12 − (−10) = −12 + 10 = 10 − 12 = −2 (iv) −8 − (−7) = −8 + 7 = 7 − 8 = −1 (v)

Now can’t you compute these?

(i) −4 − (−5)

(ii) −6 − (−9)

(iii) −12 − (−10)

(iv) −8 − (−7)

(v)

We know that for any two positive numbers x and y, we have −x − (−y) = −x + y.

(i) −4 − (−5) = −4 + 5 = 5 − 4= 1

(ii) −6 − (−9) = −6 + 9 = 9 − 6 = 3

(iii) −12 − (−10) = −12 + 10 = 10 − 12 = −2

(iv) −8 − (−7) = −8 + 7 = 7 − 8 = −1

(v)