Adding Single digit number trick
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.
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.
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