Example 1 Find Q in the addition.
Here,
Q + 3 ends with 1
We put different values of Q,
and check which ends with 1
∴ Q = 8
Checking
Putting Q = 8
Hence verified
∴ Q = 8
Made by
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.