Number Lines and Interval Notation

Which number should go in the red box?

• 360

• 390

• 400

• 450

Which number should go in the red box?

• 900

• 925

• 840

• 910

Which number should go in the red box?

• 645

• 690

• 610

• 600

1+10=11
1+11=12
11-10=1

• 1+10=11

• 1+11=12

• 11-10=1

11-3=8 8+3=11 0+8=8

• 11-3=8

• 8+3=11

• 0+8=8

• 19-7=12
• 0+12+7=19
• 12+7=19

• 9+7=16
• 16-7=9
• 9+16=27

19-1=18 18+1=19 19-18=1

• 19-1=18

• 18+1=19

• 19-18=1

11-8=3

11-3=8

3+8=11

• 11-8=3

• 11-3=8

• 3+8=11

• 2-2=0
• 0+2=2
• 2-0=2