Final answer:
To estimate the product of 7.8 and 11.4, round the numbers to their nearest whole numbers and multiply them.
Step-by-step explanation:
To estimate the product of 7.8 and 11.4 by rounding, we can round the numbers to their nearest whole numbers:
7.8 rounds to 8 and 11.4 rounds to 11
Then we can multiply these rounded values:
8 x 11 = 88
So, the estimated product of 7.8 and 11.4 is 88.