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# Rounding Off Using Number Line - PowerPoint PPT Presentation

Rounding Off Using Number Line. Round off 115 to the nearest hundred. 0. 100. 200. 300. 400. 500. 115 is between 100 and 200. Rounding Off Using Number Line. Round off 115 to the nearest hundred. X. 115. 100. 120. 140. 160. 180. 200. 115 is nearer to 100 than to 200.

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Presentation Transcript

Round off 115 to the nearest hundred

0

100

200

300

400

500

115 is between 100 and 200

Round off 115 to the nearest hundred

X

115

100

120

140

160

180

200

115 is nearer to 100 than to 200

115 is when rounded off to the nearest hundred

100

115  100

Round off 650 to the nearest hundred

500

600

700

800

900

1000

650 is between 600 and 700

Round off 650 to the nearest hundred

X

650

600

620

640

660

680

700

650 is halfway between 600 and 700

halfway

650 is when rounded off to the nearest hundred

700

650  700

Round off 874 to the nearest hundred

500

600

700

800

900

1000

?

?

874 is between 800 and 900

Round off 874 to the nearest hundred

X

874

?

800

820

840

860

880

900

874 is nearer to 900 than to 800

874 is when rounded off to the nearest hundred

900

874  900

What are the other numbers that can be rounded off to 700 aside from 650?

650

670

690

700

600

620

640

660

680

What are the other numbers that can be rounded off to 700 aside from 650?

651 - 749

650

670

690

710

730

660

680

700

720

740

750

654

657

664

667

711

745

651

661

no

655

658

665

668

725

749

652

662

yes

656

659

666

669

735

649

653

663

no

200

What are the numbers in the tens place that can be rounded off to the nearest hundred after the given number?

123456789

1 5 9

200

Example:

200 is the nearest hundred after 159

X

159

700

What are the numbers in the tens place that can be rounded off to the nearest hundred after the given number?

123456789

6 7 7

700

Example:

700 is the nearest hundred after 677

X

677

800

What are the numbers in the tens place that can be rounded off to the nearest hundred before the given number?

123456789

7 1 9

700

Example:

700 is the nearest hundred before 719

X

719

1 000

What are the numbers in the tens place that can be rounded off to the nearest hundred before the given number?

123456789

9 4 8

900

Example:

900 is the nearest hundred before 948

X

948

The number of tourist who visited Singapore last year was 600 when rounded off to the nearest hundred. What could be the actual number of tourist be?

550 – 649

What could be the maximum number of tourist who visited Singapore last year?

550

650

500

600

700

580

620

650

550

no

590

630

560

540

no

549

610

570

640

no

The number of tourist who visited Singapore last year was 600 when rounded off to the nearest hundred. What could be the actual number of tourist be?

550 – 649

What could be the minimum number of tourist who visited Singapore last year?

550

650

500

600

700

580

620

650

550

no

590

630

560

540

no

610

570

640

Challenge 600 when rounded off to the nearest hundred. What could be the actual number of tourist be?

The number of tourist who visited Singapore last year was 630 000 when rounded off to the nearest thousand. What could be the actual number of tourist be?

629 500 – 630 499

629 500

630 500

629 000

630 000

631 000

629 800

630 200

630 500

629 500

no

629 900

630 300

629 600

629 400

no

630 100

629 700

630 400