Final answer:
To estimate the product of 0.38 multiplied by 99, round the numbers to 0.4 and 100. Multiply 0.4 by 100 to get 4.
Step-by-step explanation:
To estimate the product of 0.38 multiplied by 99, we can round 0.38 to 0.4 and 99 to 100.
Then, we can use the rule that multiplying a number by 0.4 is equivalent to multiplying it by 4 and dividing by 10.
So, 0.4 multiplied by 100 is 4.
Therefore, 0.38 multiplied by 99 is approximately 4.