Ex 1.2, 4 - Chapter 1 Class 7 Integers

Transcript

Ex 1.2, 4 Fill in the blanks to make the following statements true: (i) (–5) + (– 8) = (– 8) + (............) Using commutatively a + b = b + a ∴ (−5) + (−8) = (−8) +(−5) Ex 1.2, 4 Fill in the blanks to make the following statements true: (ii) –53 + ............ = –53 −53 + 0 = −53 Ex 1.2, 4 Fill in the blanks to make the following statements true: (iii) 17 + ............ = 0 17 + ____ = 0 ____ = 0 − 17 ____ = −17 ∴ 17 + (−17) = 0 Ex 1.2, 4 Fill in the blanks to make the following statements true: (iv) [13 + (– 12)] + (............) = 13 + [(–12) + (–7)] Using associativity (a + b) + c = a + (b + c) [13 + (−12)] + (−7) = 13 + [(−12) + (−7)] Ex 1.2, 4 Fill in the blanks to make the following statements true: (v) (– 4) + [15 + (–3)] = [– 4 + 15] + ............ Using associativity a + (b + c) = (a + b) + c (−4) + [15 + (−3)] = [−4 + 15] + (−3)