1. Splash Screen

2. Five-Minute Check (over Lesson 4–1) Main Idea
Example 1: Find a Compatible Dividend
Example 2: Find a Compatible Divisor
Example 3: Use Rounding and Compatible Numbers
Example 4: Estimate to Solve Problems
Lesson Menu

3. I will estimate quotients using rounding and compatible numbers.
Main Idea/Vocabulary

4. Find a Compatible Dividend
Estimate 145 ÷ 2.
145 ÷ 2
140
÷ 2
Change 145 to 140 because and 2 are compatible numbers.
140 ÷ 2 = 70
Divide mentally.
Answer: So, 145 ÷ 2 is about 70.
Example 1

5. Estimate 215 ÷ 3. about 55 about 60 about 65 about 70 A B C D
Example 1

6. Find a Compatible Divisor
Estimate 3,500 ÷ 80.
3,500 ÷ 80
3,500
÷ 70
Change 80 to 70 because 35 and 7 are compatible numbers.
3,500 ÷ 70 = 50
Divide mentally.
Answer: So, 3,500 ÷ 80 is about 50.
Example 2

7. Estimate 4,800 ÷ 50. about 60 about 70 about 80 about 90 A B C D
Example 2

8. Using Rounding and Compatible Numbers
Estimate 439 ÷ 52.
Step 1 Round the divisor to the nearest ten.
439 ÷ 52
439 ÷ 50
Step 2 Change the dividend to a number that is compatible with 5. Notice it is easy to divide 45 by 5.
439 ÷ 52
450 ÷ 50
Example 3

9. Using Rounding and Compatible Numbers
Step 3 Divide mentally.
450 ÷ 50 = 9
Answer: So, 439 ÷ 52 is about 9.
Example 3

10. Estimate 629 ÷ 68.
about 9
about 8
about 7
about 6 A B C D
Example 3

11. Estimate to Solve Problems
Five students share 18 small pieces of veggie pizza equally. About how many pieces does each student get?
Example 4

12. Estimate to Solve Problems
One Way:
Use compatible numbers 6 and 18.
Another Way:
Use compatible numbers 20 and 5.
18 ÷ 5
18 ÷ 5 18
÷ 6 = 3 20
÷ 5 = 4
Answer: So, each student eats about 3 or 4 slices of veggie pizza.
Example 4

13. about 3 or 4 pieces of candy about 4 or 5 pieces of candy
Four friends share 18 pieces of candy equally. About how many pieces does each student get?
about 3 or 4 pieces of candy
about 4 or 5 pieces of candy
about 5 or 6 pieces of candy
about 7 pieces of candy A B C D
Example 4

14. End of the Lesson
End Lesson

15. Five-Minute Check (over Lesson 4–1) Image Bank Math Tool Chest
Interpret the Remainder
Resources

16. Find 600 ÷ 6 mentally. 10 20 100 150 (over Lesson 4–1) A B C D
Five Minute Check 1

17. Find 2,800 ÷ 4 mentally. 700 800 750 850 (over Lesson 4–1) A B C D
Five Minute Check 2

18. Find 270 ÷ 90 mentally. 13 3 4 5 (over Lesson 4–1) A B C D
Five Minute Check 3

19. Find 4,800 ÷ 800 mentally. 8 5 7 6 (over Lesson 4–1) A B C D
Five Minute Check 4

20. Find 1,800 ÷ 20 mentally. 90 80 85 75 (over Lesson 4–1) A B C D
Five Minute Check 5

21. Find 25,000 ÷ 500 mentally. 25 45 50 60 (over Lesson 4–1) A B C D
Five Minute Check 6

22. End of Custom Shows