how to solve a multiplicative question by using associative property
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When we add three or more numbers, it does not matter how we group them, because the answer will be the same:
(a + b) + c = a + (b + c)
Let’s see an example:
In a park, there were 5 fir trees and 4 pines. The gardener has planted six more pines. How many trees are in the park now?
We can solve by grouping the addends in two ways, but we will always get the same answer (15). Let’s see it with images:
First, we can add the trees that were there already in the park, (5 + 4) and then the pines that have just been planted (6). We are grouping the addends in this way:
(a + b) + c = a + (b + c)
Let’s see an example:
In a park, there were 5 fir trees and 4 pines. The gardener has planted six more pines. How many trees are in the park now?
We can solve by grouping the addends in two ways, but we will always get the same answer (15). Let’s see it with images:
First, we can add the trees that were there already in the park, (5 + 4) and then the pines that have just been planted (6). We are grouping the addends in this way:
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