Final answer:
To mentally determine whether 125 x 0.9 is less than, greater than, or equal to 125, we can use estimation. The result will be less than 125.
Step-by-step explanation:
To mentally determine whether 125 x 0.9 is less than, greater than, or equal to 125, we can use a mental math technique called estimation. Since 0.9 is less than 1, multiplying 125 by 0.9 will result in a number that is less than 125. We can confirm this by estimating the product. When we round 0.9 to 1 and multiply it by 125, we get 125. So, 125 x 0.9 is less than 125.
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