Mid-Chapter Review

Explain how to find 40 × 50 using mental math.

Choose the two answers that give the correct explanation.

• Think of 50 as 5 tens. 40 x 5 tens = 200 tens; 200 tens = 2,000

• Think of 50 as 50 tens. 40 x 50 tens = 200 tens; 200 tens = 2,000

• Think of 40 as 4 tens. 50 x 4 tens = 200 tens; 200 tens = 2,000

• Think of 40 as 40 tens. 50 x 40 tens = 200 tens; 200 tens = 2,000

Tags

CCSS.5.NBT.A.2

What are the partial products that result from multiplying 15 × 32?

• (10 × 30) + (10 × 2) + (5 × 30) + (5 × 2)

• (1 × 3) + (10 × 2) + (5 × 30) + (5 × 2)

• (10 × 30) + (1 × 2) + (5 × 3) + (5 × 2)

Tags

CCSS.4.NBT.B.5

A airline company sold 46 one-way tickets and 21 round-trip tickets from Miami to Orlando One-way tickets cost $20. Round trip tickets cost $30. How much money did the company collect?

• (46 × 20) + (21 × 30) = 1,550

• (46 × 30) + (21 × 20) = 1,800

Tags

CCSS.3.OA.D.8

Danna is planning a road trip with a group of friends. The trip will cost $32 for each friend. She is planning to go with 29 friends on this trip. What is a good estimate for the total cost of the road trip? Choose all the answers that apply.

• $1,400

• between $600 and $1,200

• $900

• $928

Tags

CCSS.4.NBT.B.5

Choose ALL the partial products for 19 x 22

• (10 X 20) = 200

• (20 X 9 ) = 180

• (2 X 10) = 20

• (9 X 2) = 18

• (20 X 2) = 40

Tags

CCSS.4.NBT.B.5

In a paper calculate all partial products for 19 x 22. What would be the final product for this equation?

• 418

• 430

• 420

• 425

• 421

Tags

CCSS.5.NBT.B.5

Choose the picture that shows the correct partial products for 12 x 83.

• 
• 
• 
• 

Tags

CCSS.4.NBT.B.5

Write the partial products that result from multiplying 14 x 72. Look at the example above for guidance on how to write the partial products.

Tags

CCSS.4.NBT.B.5