Question 11 of 33intermediate🔧 ApplyNumerical4 marks
Use unmarked number lines to evaluate these expressions: a. −125 + (−30) = _____ b. +105 − (−55) = _____ c. +80 − (−150) = _____ d. −99 − (−200) = _____
(a)
Answer
−155
(b)
Answer
+160
(c)
Answer
+230
(d)
Answer
+101
Explanation
(a) Adding two negative numbers: add their magnitudes (125 + 30 = 155) and keep the negative sign. (b) Subtracting a negative is adding the positive: 105 + 55 = 160 (c) Subtracting a negative is adding the positive: 80 + 150 = 230 (d) Subtracting a negative is adding the positive: −99 + 200 = 101