My second digit is 4 times bigger than the third digit. These are simple arithmetic maths problems. FREEBIE Math Brain Teasers The kids love having their However, many of us will tend to solve these maths riddles incorrectly.Maths puzzles and riddles for class 5 with answers. Easy, medium and difficult puzzles. The digit 5 appears ten times as the last digit (5, 15, 25 … 95) and ten times as a first digit (50, 51, 52 … 59). She seems to follow the