Chapter 6 Review

To find 50×600, multiply 5 and 6, and then write (a)   more zeros at the end.

Mental Math: 40×500=

(a)  

Evaluate 3n, when n=9,000.

(a)  

Find the best estimate and tell whether is overestimate or underestimate: 1250×87

• 80,000 Underestimate

• 100,000 Underestimate

• 125,000 Overestimate

• 100,000 Overestimate

Find the best estimate and tell whether is overestimate or underestimate: 98×1,440

• 144,000 Overestimate

• 98,000 Overestimate

• 100,000 Underestimate

• 129,600 Overestimate

Estimate the product by finding the range: 72×87

• Between 5,600 and 6,000

• Between 6,480 and 7,200

• Between 5,600 and 7,200

• Between 7,200 and 5,600

Which equation shows how to multiply 25×122×40 using the commutative property of multiplication?

• 25×122×40=(25×122)×40

• 25×122×40=25×2×40×61

• 25×122×40=25×40×122

• 25×(122×40)=(25×122)×40

Find $35.45×28= (a)  

Find 50.25×8= (a)  

Ms Yao is going to pick one Class monitor and one Math monitor from Stellar, Grace, Yuki and Anita. There are (a)   different ways can she choose.