Puzzles to test mathematical skills, set by Anita Straker. Solutions below More brainteasers on www.tes.co.ukteacherbrainteasers
1. I am a number on a 100-square.
The sum of my digits is 10.
If you reverse my digits the resulting number is 18 less than I am.
Which number am I?
2. I am a number on a 100-square.
I am 20 less than nine times the sum of my digits.
My tens digit is one more than my units digit. Which number am I?