Shilo is using commutative and associative
What is commutative property?
"For any numbers 'a' and 'b', a + b = b + a"
What is distributive property?
"For any real numbers 'a', 'b' and 'c',
a × (b + c) = a × b + a × c"
What is associative property?
For any numbers 'a', 'b' and 'c',
(a + b) + c = a + (b + c)
What is identity?
For any real number a,
the additive identity is a + 0 = 0 + a = a
For given question,
Shilo is trying to compute the value of 27 + 55 + 13.
She adds 27 + 13 to get 40, and then adds on 55.
⇒ 27 + 55 + 13
= 27 + 13 + 55 ...........(commutative property, 55 + 13 = 13 + 55)
= (27 + 13) + 55 ...........(associative property)
= 40 + 55
= 95
Therefore, Shilo is using commutative and associative property.
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