In the sentence,

Such software is referred to as threaded, or multi-threaded. The software adding, say, a column of four place numbers could drive the job into four threads: Adding the 1s-place numbers, the 2s-place numbers, the 3s-place numbers, and the 4s-place numbers. Each of those subtasks is directed to a different core.

It is from "How Computer Works" can be downloaded from http://epdf.pub/how-computers-work-9th-edition.html

What is the meaning of "a column of four place numbers"? And/or what is the meaning of "adding a column of four place numbers"?

I guess four place numbers are like "1234". Right?

Thank you in advance.

  • What is the source? What’s the surrounding paragraph or context? You can edit your post to include more details.
    – Em.
    Aug 19, 2019 at 5:14
  • It is from "How Computer Works" can be downloaded from epdf.pub/how-computers-work-9th-edition.html
    – Nori
    Aug 19, 2019 at 5:27

1 Answer 1


Your assumption is correct. The explanation is that each decimal place can be added in a separate thread, and then the results summed. E.G.


Thread A adds 5+8, gets 13 Thread B adds 4[0]+7[0], gets 110 Thread C adds 3[00] + 6[00], gets 900 Thread D adds 2[000] + 5[000], gets 7,000 Finally, a new thread would add those results. Not necessarily the fastest way to do the operation, but it illustrates multithreading.

  • Thank you for your easy-to-grasp example!
    – Nori
    Aug 19, 2019 at 6:30

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