Math : Grade 5 : Exercise 1D

Solve. Use any method you like.

1. Round to the nearest 10.

a. 1,346

First we have to find, in which two tens the number lies between.

here, 1,346 lies between 1,340 and 1,350 

In 1,346 (46-50) is close to 50

hence 1,346 rounds to 1,350

b. 2,388

2,388 lies between 2,380 and 2,390

2,388 (88-90) is close to 2,390.

hence, 2,388 rounds to 2,390

c. 1,014

1,014 lies between 1,010 and1,020

1,014(14-10) is close to 1,010.

hence, 1,014 rounds to 1,010.

d. 92,407

92,407 lies between 92,400 and 92,410

92,407(07 that is 7 - 10) is close to 92,410

hence, 92,407 rounds to 92,410.

e. 11,003

11,003 lies between 11,000 and 11,010

11,003(03 that is 3 - 0) is close to 11,000.

hence 11,003 rounds to 11,000

2. Round to the nearest 100.

a. 649

First find which two hundreds the number lies between.
here 649 lies between 600 and 700.
649 is close to 600.
hence 649 rounds to 600.

b. 5,325

5,325 lies between 5,300 and 5,400.
5,325 is close to 5,300.
hence 5,325 rounds to 5,300.

c. 6,850

6,850 lies between 6,800 and 6,900.
6,850 is the halfway point on the number line.
(8 > 5) hence 6,850 rounds to 6,900.

d. 14,910

14,910 lies between 14,900 and 15,000
14,910 is close to 14,900
hence 14,910 rounds to 14,900.

e. 58,009

58,009 lies between 58,000 and 58,100.
58,009 is close to 58,000.
hence 58,009 rounds to 58,000.

3. Round to the nearest 1000.


a. 2,364

2,364 lies between 2,000 and 3,000
2,364 is close to 2,000.
hence 2,364 rounds to 2,000.

b. 9,846

9,846 lies between 9,000 and 10,000.
9,846 is close to 10,000.
hence 9,846 rounds to 10,000.

c. 4,096

4,096 lies between 4,000 and 5,000.
4,096 is close to 4,000.
hence 4,096 rounds to 4,000.

d. 35,502

35,502 lies between 35,000 and 36,000.
35,502 is close to 36,000.
hence 35,502 rounds to 36,000.

e. 97,764

97,764 lies between 97,000 and 98,000.
97,764 is close to 98,000.
hence 97,764 rounds to 98,000.

4. Pretend that you are a newspaper reporter. Rewrite these news headlines by rounding.

a. The municipal corporation spent Rs 5,94,830 on reporting the roads. (nearest 1,000)

here, 5,94,830 lies between 5,94,000 and 5,95,000.
5,94,830 is close to 5,94,000.
hence The municipal corporation spent Rs 5,94,000 on reporting the roads.

b. 389 people attended the meeting of coin collectors in the city. (nearest 100)

here, 389 lies between 300 and 400.
389 is close to 400.
hence 400 people attended the meeting of coin collectors in the city.

c. The Rajdhani Express was delayed by 5hours and 15minutes. (nearest hour)

here, 5hrs15mins lies between 5hrs and 6hrs.
5hrs15mins is close to 5hrs.
hence The Rajdhani Express was delayed by 5hours.

5. Shade the following using crayons.

2-digit numbers that round to 70 : Red
3-digit number that rounds to 800 : Orange
4-digit numbers that rounds to 9,000 : Yellow

241, 700, 204, 420, 560, 1803, 19, 360, 480, 16, 670, 799, 71, 811, 717,797, 789, 68, 56, 1000, 9999, 7999, 148, 12, 18, 6292, 126, 71, 67, 180, 124, 32, 67, 65, 69, 71, 9356, 2589, 8010, 9102, 8976.