Question

rry has $20 to spend at the store. He plans to purchase five items that cost $5.79, $7.63, $3.46, $2.99, and $3.65. Larry estimated his total cost  to make sure he has enough money for his purchases. Is his estimate accurate? Explain why or why not. $5 + $7 + $3 + $2 + $3 = $20

Answer 1

His estimate is incorrect. He only added the whole numbers together and ignored the rest. If he were to have estimated correctly then he would have rounded to the nearest tenths place so $5.79 would become $6 and so on. The accurate total is $23.52, therefore he doesn’t have enough.

Answer 2

Sample Response: Larry did not round correctly. He used front-end estimation, but he did not round up when appropriate. His estimate will be lower than the amount of money he needs.