Traditionally the multiplication table has been considered an essential component of elementary arithmetic. We use the base ten number system, and it is very helpful to memorize fact up to 9 x 9. Learning to multiply is traditionally thought of as a milestone if elementary education because students have learned another way to manipulate numbers, leading to more complex math problems.
This is an important step in learning to perform basic operations the that are
we need to memorize the times tables?
Math is really like a set of building blocks.  You must start building at the bottom (simple operations) then build your way up (complex operations) Students who don’t have multiplication facts memorized will have a much harder time going forward in math, topics like long division, fractions and algebra include multiplication in some form. 
Humans use multiplication every day in real life, there are times when a calculator may not be handy. We use multiplication to adjust recipes, project travel times, plan our day, figure out discounts on items at the store, and to figure out the quantity of items we may need both at home and work. Knowing the times tables can help people to carry out everyday tasks that are important to them, it’s also a faster way than skip counting or adding to figure out a numerical task.
Example of different methods that compare to multiplication:
Sally has 10, five dollar bills. How much money does Sally have?
Counting by 5’s to the quantity she has (10) : 5,10,15,20,25,30,35,40,45,50
Multiplication: 5 x 10 = 50
Realizing that skip counting, and repeated adding is the same as multiplication, is very important because a student realizes that memorizing facts will be faster and easier than the two previous methods they have learned!
Let us look at the benefits of learning multiplication tables from 1 to 20
Memorizing the facts will let the child solve problems faster and without much thinking. The success of working problems in the manner will boost the student’s confidence, and encourage them to continue on with harder concepts in math.
Faster problem solving abilities
As discussed above, the student will be able to solve math problems faster, helping with anything timed (such as performance testing), they will also be able to solve problems faster at school and in everyday life.
Improves your memory
Learning multiplication tables through memorization helps in improving memory. When the brain is actively memorizing and recalling something on demand, your memory power increases. When you become capable of recalling the multiplication table up to 20, you will have increased your memory power to a certain extent. 
Multiplication Table in Practice
We have made simple multiplication tables that are a 9 cell grid. Several numbers have been replaced with images like a logic puzzle. The student must solve for the images using multiplication facts, and then type them next to the image. Each time a student completes that a new puzzle is generated. So it doesn’t become “repetitive”.