Maria introduces the concept of making change using the counting up method. She provides several examples, including buying a ball, grapes, pants, medicine, a piano book, and a batting glove. A trick for adding numbers to reach 100 is also explained to aid in mental math calculations for making change.

What is the main concept introduced in this lesson?

• Making change using counting up

• Making change using subtraction

• Making change using multiplication

• Making change using division

In the ball example, what is the first step in the counting up method?

• Add coins to reach the next whole dollar

• Add coins to reach the amount given

• Subtract the cost from the amount given

• Add coins to reach the cost

How much change is given when buying the ball for $2.35 with $5?

• $2.85

• $2.65

• $2.50

• $2.75

In the grapes example, what is the first step to reach the next whole dollar?

• Add 10 cents

• Add 2 cents

• Add 8 cents

• Add 5 cents

What is the total change given when buying grapes for $7.82 with $10?

• $2.08

• $2.38

• $2.28

• $2.18

In the pants example, what is the first step in the counting up method?

• Add 2 cents

• Add 1 cent

• Add 10 cents

• Add 5 cents

What is the total change given when buying pants for $13.99 with $20?

• $6.00

• $5.99

• $6.01

• $6.10

What is the trick for adding up to 100?

• Multiply the digits to make 10 and 9

• Add the digits to make 10 and 9

• Divide the digits to make 10 and 9

• Subtract the digits to make 10 and 9

In the trick for adding up to 100, what do you add to 7 to make 10?

• 4

• 3

• 5

• 2

How can the trick for adding up to 100 be used in mental math?

• To quickly divide numbers

• To quickly multiply numbers

• To quickly subtract numbers

• To quickly find change