Question 10 of 33intermediate🔧 ApplyNumerical6 marks
What are (i) −5 + 0 (ii) 7 + (−7) (iii) −10 + 20 (iv) 10 − 20 (v) 7 − (−7) (vi) −8 − (−10)?
(i)
Answer
−5
(ii)
Answer
0
(iii)
Answer
10
(iv)
Answer
−10
(v)
Answer
14
(vi)
Answer
2
Explanation
(i) The sum of any number and zero is the same number. (ii) The sum of a number and its inverse is zero. (iii) Subtract 10 from 20 and keep the positive sign: 20 − 10 = 10 (iv) Subtracting a larger number from a smaller gives a negative result: 10 − 20 = −10 (v) Subtracting a negative number is the same as adding the corresponding positive: 7 − (−7) = 7 + 7 = 14 (vi) Subtracting a negative number is the same as adding the corresponding positive: −8 − (−10) = −8 + 10 = 2