4.1 Estimating Quotients
I can estimate quotients with two-digit divisors
1.
2.
3.
Steps
Round the divisor to the tens place
Cancel the ones place digits in the divisor and the dividend
Use lesson 3.5 notes to find estimate
a. Round the dividend so it is compatible with the divisor
i. Use the BFFED (Best Friend For Estimating Division)
1. What multiple of the divisor is closest to the dividend
b. Solve the basic math fact
c. Bring any zeros to the answer
Examples
2417  81
Step
1- round divisor
2 – cancel ones places
3 – find compatible #’s
a – solve the basic fact
b – bring the zero to the end
3527  63
1- round divisor
2- cancel ones places
3- find compatible #’s
a - solve the basic fact
b - bring the zero to the end
Result
2417  80
2417  80
241  8
240  8
240  8 = 3
240  8 = 30
3527  60
3527  60
352  6
360  6
360  6 = 6
360  6 = 60
Samples
1) 4,729  63
Round the divisor. 63 becomes ____
Cancel the ones places. 472  6
What multiple of 6 is closest to 47? _______  ____ = ______
2) 3,894  58
Round the divisor. 58 becomes ____
Cancel the ones places. 3,894 becomes _____. 60 becomes ___.
What multiple of 6 is closest to 38? _______  ____ = ______
3) 60,058  76
Round the divisor.
Cancel the ones places.
Use your bffed.
4)
25,782  64
5)
50,000  85
6)
59,708  92