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The full year or just the last two digits?
New cards will have just the last four digits of Social Security numbers.
Clearly, many computers would have been unable to interpret dates with the year expressed by just the two digits 00 -- the Year 2000 problem -- had they not been repaired.
If a business asks for your child's social security number, ask if you can provide an alternate identifier – perhaps just the last four digits of their social security number.
Eliminating calories in just the double digits daily could prevent further weight gain and doing that in your sleep could be sweet!
(You can also look at just the first digits after the decimal points; because 7 is larger than 5, you again see that 12.75 is larger than 12.57).
Look at just the first digit of the larger number.
Just like a simpler division problem, you can start by looking at the smaller number, and asking "Does it fit into just the first digit of the larger number?" Let's say you're solving 3472 ÷ 15.
For those who aren't familiar with it, sudoku is a popular logic-based puzzle where numbers are placed into a 9×9 grid so that each column, each row, and each of the nine 3×3 sub-grids contain just one of the digits between 1 and 9. Sudoku has been around for a long time but was popularised by the Japanese under its current name, which comes from the Japanese for single number.
"They somehow had my mobile and the whole of my debit card number – not just the last four digits – you have to have ones from the middle to make the payments," she says.
Your Social Security Number may also be on the form - or just the last few digits.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com