Page 131 - New Medley 4 Semester 1

Property 2: Now, let us add 21574, 17248 and 27841.

[21574 + 17248] + 27841 = 38822 + 27841 = 66663

Or 21574 + [17248 + 27841] = 21574 + 45089 = 66663

We get the same sum in both cases.

So, we can change the grouping of three numbers when
finding their sum.

rd
nd
st
[1 number + 2 number] + 3 number
rd
nd
st
= 1 number + [2 number + 3 number]
A, B and C be any three numbers then:

[A + B] + C = A + [B + C]

Property 3: Let us add 32475 and 0.

3 2 4 7 5

+ 0

3 2 4 7 5

Thus 32475 + 0 = 32475

We see that when 0 is added to a number.

Now let us add 0 and 32475.

0

+ 3 2 4 7 5

3 2 4 7 5

0 + 32475 = 32475

A number is added to zero, the sum is the number
itself.

Let A be any number then:

A + 0 = A and 0 + A = A

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