KwickClips Java · 41 sec · free
Why is 153 special?
Short answer. It is an Armstrong number: the cubes of its digits add up to 153.
How do you take a number apart?
% 10 gives the last digit and / 10 removes it.
Special numbers
| Type | Example |
|---|---|
| Prime | 7 |
| Perfect | 6 = 1+2+3 |
| Armstrong | 153 |
| Palindrome | 121 |
Remember
| % 10: last digit |
| / 10: remove it |
One five three is special. Do you know why? Prime has two factors. Perfect equals its factor sum. Armstrong sums digit cubes. Palindrome reads the same reversed. Percent ten gives the last digit. Divide by ten removes it.
This clip is from the full lesson: Nested Loops, Patterns and Number Programs — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ICSE Class 10 Computer Applications
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