ReasonablenessReasonableness

Essential Question:Essential Question:How can you judge the reasonableness of the

results of number estimates or computations?

SPI: 6.1.2

What does it mean to be

REASONABLE?

Example 1:

Which is the most reasonable estimate for the SUM of 4.01 and 6.92?

a) 2b) 11c) 28d) 20

Example 2:

Which is the most reasonable estimate for the SUM of 3.08 and 6.07?

a) 10b) 9c) 3d) 18

Example 3:

Delia received $85 for his birthday. He wants to use the money to buy concert tickets. If the tickets cost $18 each, how many tickets can Dario purchase?

Example 4:

Kerry is going to the movies and needs to purchase tickets for her and her friends. Each movie ticket cost $7.50. Kerry has $36, how many tickets can she purchase ?

Example 5:

Paul is having a cookout and needs to purchase ice cream sandwiches for dessert. One pack costs $3.55. Paul has $15.00. How many packs of ice cream sandwiches can he purchase?

Example 6:

Kerry is going to the movies and needs to purchase tickets for her and her friends. Each movie ticket cost $7.50. Kerry has $36, how many tickets can she purchase ?

Example 7:

Hot dogs come in packages of 38. You buy 11 packages for a cookout. Estimate how many hot dogs you buy ?

Example 8:

You need to make 62 blueberry muffins. One batch of muffins makes 18. How many batches do you need to make?

Example 7:

Peter is multiplying 4.119 by 10.5. ALL of the ESTIMATES below for the solution are reasonable EXCEPT which one?

a) 39b) 40c) 41d) 42

Example 8:

A CD cost $19.95. Jake gets a 10% DISCOUNT. About how much does he pay for the CD?

a) $2b) $18c) $21d) $23

Example 9:

The 6th graders at LMS are going on a field trip. There are 410 students going. Each school bus holds 60 students. How many busses are needed for each student to attend the field trip?

Example 10:

Danielle is buying gifts for her friends for the holiday season. She decided to purchase the same hair bows for each friend. Each hair bow cost $4.50 each. She has $25 to spend. How many hair bows can she purchase?

Ticket Out The Door:Ticket Out The Door:1. Abby is bringing cupcakes to school for

her birthday. There are 140 students in her mini-school that she wants to give a cupcake to. One pack contains 25 cupcakes. How many packs must Abby bring to make sure everyone is included?

2. Timmy received $40 for his birthday. He wants to use the money to buy video games. If the video games cost $9 each, how many games can Timmy purchase?