1000
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4*1010 = 40 000 000 000 Forty billion.
180,000
-2990
One tenth = 1/10 = 10/100 = 10 per cent.
One tenth of 390 is equal to 39. To find one tenth of a number, you divide the number by 10. In this case, 390 divided by 10 equals 39. Therefore, one tenth of 390 is 39.