Answers and Step-by-step explanations:
For Question 1.)
First, you need to solve 52.1 divided by 5 to figure out the answer. So, we do the long-division of 5 goes into 52.1 10 times, with a remainder of 42.
(Important:) Because the question asks us to estimate, we need to round our answer. Remember: Anytime that a number is on a scale of 4 - 9, the answer does not get rounded up. But if a number is on a scale of 5 - 9, then it gets rounded up. Also, when rounding, you need to look at the placement behind what you are rounding to, which in this case we are looking at the tenths placement: .4 in 10.42.
Fourty-two is on the 4 - 9 scale, so it does not get rounded. So, your answer of 50 divided by 5 = 10 is correct.
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For Question 2.)
First, you need to solve 719.2 divided by 7 once more to figure out the answer. So by doing long division again, we get a big scary-looking number of 102.742857143. But don't be nervous, just remember the rounding rule above.
So we look at the tenths placement, which is the first 7 in 102.742857143. This number is on the 5 - 9 scale, so the number we are trying round gets rounded up. Now we have 103.
But this question is different. Now we need to round 103 to the nearest 100. There are no decimals, but we do need to look at the ones and tens placement. Three is on the 1 - 4 scale, so it doesn't get rounded up. So 103 rounded to the nearest 100 is 100. So the correct answer is 700 divided by 7 = 100.
I hope this helps.