Adding and Subtracting on the Number Line

The video tutorial explains how to calculate the total number of laps Ying Ying ran using a number line. It starts with her initial 30 laps and adds additional laps run before school, at lunch, and at recess. The tutorial then transitions to a similar problem involving a red ant army, demonstrating how to use a number line to determine the remaining ants after some are lost. The video emphasizes the use of number lines for visualizing and solving addition and subtraction problems.

How many laps had Ying Ying run initially for the Running Club?

• 25

• 35

• 30

• 20

How many additional laps did Ying Ying run before school?

• 5

• 2

• 4

• 3

How many laps did Ying Ying run at lunch?

• 3

• 2

• 5

• 4

How many laps did Ying Ying run at recess?

• 4

• 3

• 2

• 1

What was Ying Ying's total number of laps after all her running activities?

• 41

• 39

• 37

• 35

How many ants did the red ant army start with?

• 90

• 105

• 95

• 100

How many ants were lost down a hole?

• 3

• 5

• 4

• 2

How many ants were eaten by a bird?

• 2

• 5

• 3

• 4

How many ants blew away?

• 2

• 4

• 3

• 1

What is the final number of ants left in the red ant army?

• 90

• 91

• 92

• 93