Operations on number line

Q.

If I want to reach number 7 on the number line from number 1, then how many steps do I need to move considering each 1 unit as 1 step.

1. 5
2. 4
3. 6
4. 7

Q.

Samayra is standing on number 10 on the number line. She jumps 4 steps to the left each of 1 unit. Where will she be standing now?

1. 14

2. 4

3. 3

4. 6

Q.

Ajit lives on the 18^th floor of a building. He came down 9 floors and collected his Maths textbook from his friend Karan. Later, he went up along with Karan to Goutham's house which is 12 floors above Karan's for group work. If Goutham lives on the topmost floor of the building, how many floors does the building have?

1. 21

2. 17

3. 7

4. 20

Q.

Fill in the blanks:

$\{15+(-8\left)\right\}+24=\mathrm{\_\_\_\_\_\_}+\{-8+24\}$