Compatible Number
Definition of Compatible Number

Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide
mentally.

They are useful in estimating the sum, difference, product, or quotient.
Examples of Compatible Number
To estimate the quotient, choose the compatible numbers 12 and 4 as 12 and 4 are compatible with each other. Also notice that 12 is closer to 13 and 4 is closer to 3.6.
Solved Example on Compatible Number
Find the value of 61 × 5.8.
Choices:
A. 360
B. 300
C. 65
D. 10
Correct Answer: A
Solution:
Step 1: Compatible numbers for 61 and 5.8 are 60 and 6 respectively.
Step 2: So, 61 × 5.8 = 60 × 6 = 360.
Related Terms for Compatible Number
 Estimation
 Sum
 Product
 Difference
 Quotient
Additional Links for Compatible Number