Ican't find out how to solve these number lines without using decimals, !

Instead of using decimals, you can use this: _,_

ex. 2,8

hope this helped

3-18-33-48-63-78-93
6-16-26-36-46-56
11-18-25-32-39-46-53
14-22-30-38-46-54-62
Make all of your first numbers 0.
So in the first one.
0 _ _ 45 _ _ 90
You subtract 3 from all numbers.
The first gap is 0 too 45.
So divide 45 by gaps including the last number. 0 is first number 45 is last.
45/3=15
0-15-30-45-60-75-90
Now add your 3 back in.
3-18-33-48-63-78-93

Use this formula for all parts.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)