Sorry, no online dictionaries contain the exact phrase number system in which 64 is 100.

Reverse dictionary results:
1. decimal
 2. hundredth
3. decimal system
4. folio
5. yard
6. ten
7. positional notation
8. logarithm
9. gadolinium
10. googol
 11. hundred
12. thousand
13. binary
14. octal
15. grand
16. 1000
17. fermium
18. index number
19. thou
20. chiliad
 21. one thousand
22. duodecimal
23. radix
24. base
25. ridership
26. decade
27. hdtv
28. hex
29. modulus
30. tenner
 31. variety
32. syntax
33. batch processing
34. body
35. configuration
36. degree
37. group
38. network
39. numerical
40. point system

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You can look up the words in the phrase individually using these links:   number ?   system ?   in ?   which ?   64 ?   is ?   100 ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
numb*to search for words beginning with numb, or
* 100to search for words ending with 100
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