Blend tool do calculation for you

Illustrator Blend tool (W) has built-in calculator script that enable to do a form of simple calculation for you. For example, you draw two objects such as lines or any shapes, and positioning some distance apart, and after you need to have another six more objects evenly spaced and placing those objects between the two original. Rather than doing any math calculation to figure out distance equally for all the objects allocation, you can just use the simple feature that come with Illustrator Blend tool that could easily re-allocating all the objects within 5 secs.

How you can do it, just by selecting the Blend tool, click on one object, avoiding anchor points. Then, Option-click (PC: Alt-click; MAC: Option-click) on the other line. In the dialog, enter the number of new objects you want for the specified steps. Illustrator automatically will do the math calculation and evenly spaces the new objects between the two originals. (And, since the effect is live, the spacing will automatically update if you move either of the two original objects) Thus, those steps you have specified are still be editable if you wanted to increase or reduce the numbers even though you had applied, as long as all the objects have not been expanded yet. To edit the number of Blend, just by selecting the objects with Item tool (black arrow tool), then double click on Blend tool from the tool box to bring out the specified step dialogue for you to change the steps setting.

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