The most and least common four-digit PIN numbers - is yours on list?
With 10,000 possible combinations for a four-digit PIN, it should be quite difficult ... as people still use common words or ...
BBC5mon
Brainteaser of the week: Can you crack the code to open the door?
Two attempts have already been made to find the right four-digit combination. Some of the numbers used were correct, so see if you can work out the rest. Looking at attempt one (9634), there are ...
BBC2y
Subtract up to 4-digit numbers
Numbers can be subtracted using the column method. Watch this video to learn about subtracting 4-digit numbers using the column method. When using a place value column to subtract two large ...