Grade 1 to 5 Find missing number from equation

This pdf file has 48 addition and subtraction equations for finding out missiong number. This concept will be used to solve many other algebric equations in various competative maths exam.
Please watch you tube tutorial for this concept.

https://youtu.be/zDharcHhfIU

Please click here to download the file. Please take printout and solve it to get the concept stronger.