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20.9 tens.
There are 78.7 tens in the number 787
There are 49784.216 lots of 100 tens in the number.
431 is a prime number. Therefore, its only prime factor is itself (431).
The number 142 has 14 tens. This is found by dividing 142 by 10, which gives 14.2; the whole number part, 14, represents the number of tens.