LaxmiAcademy

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https://www.youtube.com/watch?v=wCln1fzvaDQ Tips for mental addition Start from left Avoid using  words like "plus", and" as that takes time to process. Practice, practice Learn compliments.            

https://www.youtube.com/watch?v=O9pDF5eGfw0 Adding two digit numbers mentally is easy once you practice few examples. 16 =10+6 1 is in the tens place so value of 1 =10 6 is in the units place so value of 6 =6 Begin adding from the left column.  

https://www.youtube.com/watch?v=jxJVomBW8tg 25 can be written as 100/4 If you want to multiply any number by 25, Multiply by 100 and divide by 4. Multiplying any number by 100, you just add two zeros towards the end of the number and then divide by 4

https://www.youtube.com/watch?v=XwzK68l0hJo Dividing any number by 5 can be made easy  by multiplying and dividing by 2. Multiplying and dividing by same number does not change the value of the original number. Multiplying by 2 is same as doubling the number . 16/5 =16/5 X 2/2 =32/10 =3.2

https://www.youtube.com/watch?v=Kx4KdXeUSWA We can add numbers mentally by knowing the complements of a number. The "complement" is the number to add to  make 10 (or 100, 1000, etc, depending on how many digits we have) Let us see complement to make 10. Complement of 1<->9 2<->8 3<->7 4<->6 5<->5 Once you know compliments at the tip of your tongue then it is easy to solve addition problems. First scan the complements and then add remaining numbers to the total of complements.

https://www.youtube.com/watch?v=rqymPFil-So 5=10/2 If we want to multiply any number by 5 then multiply by 10 and divide by 2. This concept makes multiplication of bigger numbers easier. To multiply any number by 10, you put 0 at the end of the number Ex 23 X 10=230 456 X 10=4560 Then divide by 2. Ex 21 X 5 = 21*10/2 =210/2 =105  

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https://www.youtube.com/watch?v=8sVKCDHp0ao You write number 1 to 9 in tic toe table and add 1 in front on numbers in the second row and 2 in the third row and you have 3 times table ready.  

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https://www.youtube.com/watch?v=v83FvqVNfYQ Tips Less than sign is like a tilted L . Once you identify less than sign then other sign is greater than Inequality signs are like animal mouth. Animal opens the mouth towards bigger number.