Model This Area! :P

1) Which are partial products when finding 3,142 x 5. Select ALL that apply. [4.11]

• 50 x 5

• 40 x 5

• 100 x 5

• 300 x 5

• 3,000 x 5

Select ALL the expressions that have a product of 840. [4.11]

• (8 x 100) + (4 x 10)

• 7 x 120

• (8 x 2) x 1

• 105 x 8

• (8 x 100) x (4 x 10)

Estimate 4 x 750.

Which equation is the best to estimate the product?

• 4 x 710

• 4 x 900

• 4 x 800

• 4 x700

Estimate 4 x 750.

• 3000

• 3200

• 2500

• 2000

4) Which equation do the place value blocks represent? [4.11a]

• 2 x 221 = 663

• 2 x 122 = 726

• 2 x 121 = 242

• 2 x 363 = 1,089

5) Which expression does the area model represent? [4.11]

• 4 x 55
• 5 x 405
• (5 x 40) + 5
• 5 x 45

6) What are the partial products of this area model? [4.11]

• 20 + 14 + 11 + 17

• 100 + 70 + 40 + 28

• 2,000 + 50
• 540 + 55

6) What is the product of this equation? [4.11]

• 1328

• 238

• 258

• 338

8) How would you use "mental math" to solve 6 x 399? [4.12]

• (6 x 300) + (6 x 90) + (6 x 9)

• (6 x 400) + (6 x 1)

• (6 x 400) - (6 x 1)

• (6 x 300) + (6 x 99)

9) The product of 456 x 2 is 912. Maria checked her work by estimating the product and got an answer of 1000. Does Maria's estimate show the product is reasonable or unreasonable? [4.3b]

• Reasonable

• Unreasonable