Estimating the Quotient
We will learn estimating the quotient.
To estimate the quotient, we first round off the divisor and the dividend to the nearest tens, hundreds, or thousands and then divide the rounded numbers.
In a division sum, when the divisor is made up of 2 digits or more than 2 digits, it helps if we first estimate the quotient and then try to find the actual number.
(i) Divide 84 by 21
Round the number to the nearest ten
84 ÷ 21 → 80 ÷ 20
Calculate mentally.
8 ÷ 2 = 4
Estimated quotient = 4
(ii) 242 ÷ 22
Round to the nearest ten
240 ÷ 20
Calculate mentally
24 ÷ 2 = 12
Estimated quotient = 12
In
the process of division, the estimation of quotient plays a great role
in its solution. Let us see this in the following questions on division.
1. 74 ÷ 35
2. 627 ÷ 23
3. 694 ÷ 56
4. 975 ÷ 48
1. 74 ÷ 35 is approximately the same as 70 ÷ 40, i.e., 7 ÷ 4 (74 → 70 & 35 → 40)
7 ÷ 4 is approximately 2.
So, estimated quotient is 2.
2. 627 ÷ 23 is approximately the same as 600 ÷ 20 = 60 ÷ 2 = 30
(627 → 600 & 23 → 20)
So, the estimated quotient is 30.
3. 694 ÷ 56 is approximately the same as 700 ÷ 60 or 70 ÷ 6
70 ÷ 6 is approximately = 12.
So, the estimated quotient =12
4. 975 ÷ 48 is approximately 1000 ÷ 50 = 100 ÷ 5 = 20
So, estimated quotient = 20
Question and Answers on Estimation in Division:
1. Estimate by rounding each number and then divide. One is done for you.
Answers:
(ii) 90 ÷ 30; Q = 3, R = 0
(iii) 300 ÷ 100; Q = 3, R = 0
(iv) 2400 ÷ 1000; Q = 2, R = 400
(v) 700 ÷ 200; Q = 3, R = 100
(vi) 5400 ÷ 4000; Q = 1, R = 1400
(vii) 9000 ÷ 6000; Q = 1, R = 3000
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Related Concept
● Addition
● Word
Problems on Addition
● Subtraction
● Check
for Subtraction and Addition
● Word
Problems Involving Addition and Subtraction
● Estimating
Sums and Differences
● Find the
Missing Digits
● Multiplication
● Multiply
a Number by a 2Digit Number
● Multiplication
of a Number by a 3Digit Number
● Multiply a Number
● Estimating Products
● Word
Problems on Multiplication
● Multiplication
and Division
● Terms Used in
Division
● Division
of TwoDigit by a OneDigit Numbers
● Division
of FourDigit by a OneDigit Numbers
● Division
by 10 and 100 and 1000
● Dividing Numbers
● Estimating
the Quotient
● Division
by TwoDigit Numbers
● Word
Problems on Division
4th Grade Math Activities
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