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Lesson 10.6
Mental Math: Estimate Quotients
Estimate the quotient.
1. 392 ! 4
2. 489 ! 6
3. 536 ! 9
4. 802 ! 8
5. 632 ! 7
6. 32,488 ! 4
7. 3,456 ! 5
8. 7,820 ! 8
Estimate to compare. Write !, ", or # for each
!.
9. 276 ! 3
! 460 ! 5
10. 332 ! 6
! 412 ! 5
11. 527 ! 6
! 249 ! 3
12. 138 ! 2
! 544 ! 9
13. 478 ! 7
! 223 ! 3
14. 3,112 ! 8
! 1,661 ! 8
Problem Solving and Test Prep
USE DATA For 15–16, use the table.
Resting Heartbeats of Select
Mammals
15. Which beats faster, a dog’s heart in
5 minutes or a mouse’s heart in
1 minute?
16. Which beats slower in 1 minute: a
human’s heart or a horse’s heart?
17. A Common Loon’s heart beats about
Rate per 5 minutes
Human
375
Horse
240
Dog
475
Mouse
2,490
18. Nine equal-length Arizona Black
1,250 times in 5 minutes. What is the
best estimate of the number of times
its heart beats in one minute?
Rattlesnakes laid in a row measure
378 inches. What is the best estimate
of the length of 1 rattlesnake?
A 20
A 20
40
C 250
D 400
B
© Harcourt
© Harcourt
Mammal
40
C 200
D 400
B
PW61
Practice