Quandaries
and Queries 

for how many numbers less than 100 is the digit in the ones place half the digit in the tens place? 

Hi Paul, If xy is such a number then y is half of x, so x must be even. How many even digits are there? Once you know x how many choices are there for y? Once you think you know how many there are, there are only a few, write them all down just to check. Penny 

