Ncert Solutions For Class 7 Maths Ex 15.1

Ncert Solutions For Class 7 Maths Chapter 15 Ex 15.1

Q.1. Identify the nets which can be used to make cubes (cut out copies of the nets and try it):

1

Solution:

Cube’s nets are (2), (3), (4) and (6).

Q.2. There are dots on each side of a cubical dice. The sum of the dots on opposite sides of the dice is 7.Two shapes are given with empty boxes which constitute a dice. Fill the empty boxes with a suitable number such that the sum of the numbers on the opposite sides should be equal to 7.

Insert suitable numbers in the blanks, remembering that the number on the opposite faces should total to 7.

2 3

Solution:

4

Q.3.Is the given figure forms a die? Justify your answer.

5

Solution: No, this cannot be a net for a die. Because one pair of opposite faces will have 1 and 4 on them and another pair of opposite faces will have 3 and 6 on them whose total is not equal to 7.

Q.4.Make a cube from the incomplete net that is given in the figure. Note that a cube has 6 faces and make this cube in two ways.

6

Solution: There are three faces given:

7

Q.5. Match the nets with appropriate solids:

8

Solution:

9

 

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