Algebra-1

To determine which numbers should be grouped in 180 + 50 + 220, let's evaluate each option:

A. (180 + 50) + 220

Adding 180 and 50 gives 230, then adding 220 results in:

Calculation: 230 + 220 = 450.

B. 180 + (50 + 220)

Here, adding 50 and 220 first gives 270, then adding 180 results in:

Calculation: 180 + 270 = 450.

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