JSS 1 Mathematics Flashcards: Rounding and Approximating Arithmetic Results

Question 1

Round 764 to the nearest ten.

Accepted Answer

760

Question 2

To the nearest hundred, 764 becomes ________.

Accepted Answer

800

Question 3

A crowd of 4,382 people is reported to the nearest thousand. What is the estimate?

Accepted Answer

4,000

Question 4

What happens when the digit immediately after the rounding place is 5 or more?

Accepted Answer

The rounding digit increases by 1

Question 5

Estimate 267 + 341 by rounding each number to the nearest hundred.

Accepted Answer

600

Question 6

Using nearest hundreds, the approximate value of 782 − 319 is ________.

Accepted Answer

500

Question 7

A quick estimate for 48 × 21 is found from 50 × 20. What is the estimate?

Accepted Answer

1,000

Question 8

Estimate 612 ÷ 31 by using 600 ÷ 30.

Accepted Answer

20

Question 9

A trader spends ₦1,980 and ₦3,050. To the nearest thousand, her total spending is about ________.

Accepted Answer

₦5,000

Question 10

A stadium count of 4,876 is announced to the nearest hundred. The announcement should be ________.

Accepted Answer

4,900

Question 11

Ife rounds 368 to the nearest hundred and writes 300. How should the answer be corrected?

Accepted Answer

Write 400 because 68 is at least 50

Question 12

Why can an estimated answer differ from the exact answer?

Accepted Answer

Rounded inputs lose some exact detail

Question 13

Complete the statement: 2,499 rounded to the nearest thousand is ________.

Accepted Answer

2,000

Question 14

At the halfway point, 2,500 rounded to the nearest thousand becomes ________.

Accepted Answer

3,000

Question 15

Which whole-number range rounds to 70 when rounding to the nearest ten?

Accepted Answer

65 to 74

Question 16

Round 54,649 to the nearest hundred.

Accepted Answer

54,600

Question 17

First calculate 246 + 389, then round the result to the nearest ten.

Accepted Answer

640

Question 18

A national event attendance of 184,721 is best reported approximately as 185,000 to the nearest ________.

Accepted Answer

thousand

Question 19

About 9,850 exercise books are shared equally among 10 schools. Using 10,000 ÷ 10 gives roughly how many per school?

Accepted Answer

1,000 books

Question 20

How does 6,452 round at two different levels?

Accepted Answer

6,500 to the nearest hundred and 6,000 to the nearest thousand

Strong work.