this wavy symbol, which means is approximately equal to: ≈.
Suppose you want to add these number:
The approximate answer is 3,800. This answer isn’t far off from the exact answer, which is 3,792.
5
6 Estimate
7 Estimate
8 Estimate
Practice Questions Answers and Explanations
1
(a) 80.
(b) 220.
(c) 1,890.
(d) 6,500.
2
(a) 300.
(b) 2,300.
(c) 8,000.
(d) 40,000.
3
(a) 7,000.
(b) 9,000.
(c) 23,000.
(d) 800,000.
4
(a) 5,000,000.
(b) 11,000,000.
(c) 99,000,000.
(d) 5,556,000,000.
5 280.
6 5,500.
7 1,400.
8 7,000.
In the section that follows, you’ll find a quiz that tests your rounding and estimating skills from this chapter.
Whaddya Know? Chapter 3 Quiz
Answer these 12 questions to test the skills you learned in this chapter. When you’re done, flip to the next section for answers and explanations.
1 Which digit is in the ten-thousands place of the number 34,921,706,488?
2 Which digit is in the hundred-thousands place of the number 987,654,321,000?
3 Which digit is in the millions place of the number 7,261,945,803?
4 Round the number 875,921 to the nearest hundred.
5 Round the number 875,921 to the nearest thousand.
6 Round the number 805,921 to the nearest hundred-thousand.
7 Round the number 805,921 to the nearest million.
8 Round the number 55,555 to the nearest ten.
9 Estimate the sum by rounding each number to the nearest ten before adding:
10 Estimate the sum by rounding each number to the nearest hundred before adding:
11 Estimate the result by rounding each number to the nearest ten before adding and subtracting:
12 Estimate the result by rounding each number to the nearest million before adding and subtracting:
