### Remember

- Every positive integer is larger than every negative integer.
- Zero is less than every positive integer.
- Zero is larger than every negative integer.
- Zero is neither a negative integer nor a positive integer.
- Farther a number from zero on the right, larger is its value.

**1. Using the number line write the integer which is :**

(a) 3 more than 5 (b) 5 more than –5 (c) 6 less than 2 (d) 3 less than –2 |

**Answer:**

(a) 3 more than 5 | =8 |

(b) 5 more than –5 | =0 |

(c) 6 less than 2 | =-4 |

(d) 3 less than –2 | =-5 |

**2. Use number line and add the following integers :**

**(a) 9 + (– 6) (b) 5 + (– 11) (c) (– 1) + (– 7)**

**(d) (– 5) + 10**

**(e) (– 1) + (– 2) + (– 3)**

**(f) (– 2) + 8 + (– 4)**

**Answer:**

**3. Add without using number line :**

**(a) 11 + (– 7)**

**(b) (– 13) + (+ 18)**

**(c) (– 10) + (+ 19)**

**(d) (– 250) + (+ 150)**

**(e) (– 380) + (– 270)**

**(f) (– 217) + (– 100)**

**Answer:**

(a) 11 + (– 7) | = 4 |

(b) (– 13) + (+ 18) | = 5 |

(c) (– 10) + (+ 19) | = 9 |

(d) (– 250) + (+ 150) | = -100 |

(e) (– 380) + (– 270) | = -650 |

(f) (– 217) + (– 100) | = -317 |

**4. Find the sum of :**

**(a) 137 and – 354**

**(b) – 52 and 52**

**(c) – 312, 39 and 192**

**(d) – 50, – 200 and 300**

**Answer:**

(a) 137 and – 354 | 137+(-354) | = -217 |

(b) – 52 and 52 | 52+(-52) | = 0 |

(c) – 312, 39 and 192 | 39 + 129 + (-312) | = -81 |

(d) – 50, – 200 and 300 | -(50 +200) + 300=-250+300 | = 50 |

**5. Find the sum :**

**(a) (– 7) + (– 9) + 4 + 16**

**(b) (37) + (– 2) + (– 65) + (– 8)**

**Answer:**

(a) (– 7) + (– 9) + 4 + 16 = –( 7 + 9) + 4 + 16= -16 + 20 | = 4 |

(b) (37) + (– 2) + (– 65) + (– 8) = 37–(2 + 65 + 8)=+37-75 | = -38 |

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