Unit 4 Contents

16. For each problem, tell if the statement reflects a reasonable estimate or not.
1. 565 + 221 is more than 1000.
2. 234 + 735 is less than 1000.
3. 159 + 202 is more than 400.
4. 787 + 295 is less than 1000.
5. 125 + 195 is more than 500.

Check-In: Questions 17–20

17. Solve the following problems. Use any method you choose.
1. 
2. 
3. 


18. Choose a problem from Question 17 to solve using a mental math strategy.
19. The TIMS Candy Factory needed 1000 candies to be made by Tuesday evening. Using estimation, did Joe and Rhonda make enough candy Monday and Tuesday? Explain how you found your answer.
    
20. Use base-ten pieces to find the number of candies Rhonda and Joe made on Tuesday.