Students can Download Class 8 Maths Chapter 1 Playing with Numbers Ex 1.5 Questions and Answers, Notes Pdf, KSEEB Solutions for Class 8 Maths helps you to revise the complete Karnataka State Board Syllabus and to clear all their doubts, score well in final exams.

## Karnataka State Syllabus Class 8 Maths Chapter 1 Playing with Numbers Ex 1.5

Question 1.

Using the numbers from 5 to 13 construct a 3 × 3 magic square. What is the magic sum here? What relation is there between the magic sum and the number in the central cell?

Answer:

Magic sum is 27

Central number is 9

We have ⇒ 27 = 3 × 9

Magic sum is 3 times the central number.

12 | 5 | 10 |

7 | 9 | 11 |

8 | 13 | 6 |

Question 2.

Using the numbers from 9 to 17 construct a 3 × 3 magic square. What is the Magic sum here? What relation is there between the magic sum and the number in the central cell?

16 | 9 | 14 |

11 | 13 | 15 |

12 | 17 | 10 |

Answer:

The magic sum is 39

Central Number is 13

we have ⇒ 39 = 3 × 13

The magic sum is 3 times the central number

Question 3.

Starting with the middle cell in the bottom row of the square and using numbers from 1 to 9 construct a 3 × 3 magic square.

Answer:

2 | 9 | 4 |

7 | 5 | 3 |

6 | 1 | 8 |

Question 4.

Construct a 3 × 3 magic square using all odd numbers from 1 to 17.

Answer:

15 | 1 | 11 |

5 | 9 | 13 |

7 | 17 | 3 |

Question 5.

Construct a 5 × 5 magic square using all even numbers from 1 to 50.

Answer:

34 | 48 | 2 | 16 | 30 |

46 | 10 | 14 | 28 | 32 |

8 | 12 | 26 | 40 | 44 |

20 | 24 | 38 | 42 | 6 |

22 | 36 | 50 | 4 | 18 |