Homework & Practice 4-5 page 193 - 194

 $0.8\ x\ 0.8\ =$  

Answer explanation

0.64

 $0.7\ x\ 1.6\ =\$  

 $1.9\ x\ 0.4\ =$  

 $2.8\ x\ 0.6\$ 

 $5.6\ x\ 0.8\$  

 $0.9\ x\ 4.1\$   

 $4.4\ x\ 0.7\$  

 $0.2\ x\ 6.8\$  

Phil uses the model below to help him multiply decimals. Write a multiplication equation to represent the decimal model.

• 
  

  $9\ x\ 5\ =\ 45$

• $0.09\ x\ 0.05=0.0045$
  

• $0.9\ x\ 0.5=0.45$
  

• $0.\ 9\ x\ 5\ =\ 4.5$

Vocabulary

Describe the difference between an underestimate and an overestimate.

• An underestimate is less than the actual answer. An overestimate is greater than the actual answer.

• An overestimate is less than the actual answer. An underestimate is greater than the actual answer.