999 = 9*103 + 9*102 + 9
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921 and 129
Largest possible number: 9 2 1 Smallest possible number: 1 2 9
The largest is 921 and the smallest is 129
Kwan has modeled a number that is less than 999. His model has twice as many 100-blocks as 10-blocks. It has twice as many 10-blocks as 1-blocks. What is the number?
842