Module 4 : Mental Math

Students sell 300 tickets to a school play for $6 each. They collect 1,800, for tickets. How much would the students collect if they sold 3,000 tickets?

• $180,000

• $18,000

• $180

• $18

Answer explanation

300 x 6 = 1,800

so..

3,000 x 6 = 18,000

Reagan has 120 inches of string. She cuts the string into 6-inch pieces. How many pieces of string does Raegan cut?

• 720

• 180

• 60

• 20

The local fair had 5,600 people attend over 7 days. If the same number of people attended each day, how many people attended the first day?

• 8

• 80

• 800

• 8,000

Answer explanation

5,600 / 7 = n

n= 800

Between which pair of numbers is the product of 278 x 9?

• 200 and 300

• 900 and 1,800

• 1,800 and 2,700

• 2,700 and 3,600

Answer explanation

Estimate 278 , highest number is 300, and lowest number is 200.

200 x 9 = 1800

300 x 9 = 2700

Mrs. Hogner divides 127 fourth graders students into 4 groups. Which equation shows the closest estimate for the number of students in each group?

• 160 / 4 = 40

• 120 / 4 = 30

• 80 / 4 = 20

• 40 / 4 = 10

Multiply:

5 x 68 =

(a)  

Multiply:

6 x 3 x 50 =

(a)  

Divide:

320 / 8 =

(a)  

Divide:

3,025 / 5 =

(a)  

Brooklyn completes 28 / 7 as part of a division pattern. What are the next two quotients in the pattern?

280 / 7 = n

2,800 / 7 = m

• n = 40 , m= 400

• n = 400 , m= 4000

• n = 4 , m= 40