Addition means joining things together. It can also be defined as Combining collections of objects together into a larger collection is Addition.It is represented by the ‘+’ sign.
We can add the integers using the number line.
Add a positive integer by moving to the right on number line.
If we reverse the terms in a sum left-to-right, and the result is the same as the last one.It is called commutativity of addition.So that, if a and b are any two numbers, then a + b = b + a
Let us say 4 stars and 3 stars
For any three numbers a, b, and c, (a + b) + c = a + (b + c).
If we say, (1 + 3) + 4=?
When we add zero to any number, the quantity does not change. For any a, a + 0 = 0 + a = a.
Let we say, 5 + 0 = ?
- Count 0 after five. 5 + 0 = 5
- If we say, 0 + 5. Count 5 after zero. 0+5= 5
- So that, 5 + 0 = 0 + 5 = 5
If we add two numbers any order we get the same answer.
Let us say, 4 + 6 = 10. As well as 6+4=10.
So that, 4, 6 and 10 are the members of the fact family.
A doubles + 1 fact is one in which one addend is only one more than the other addend for e.g. 5 + 6 = 11