You would round it down... to 80.
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81 rounded to the nearest 10 is 80
The answer is 80
149,100,000, rounded to the nearest 10 million = 150,000,000149,100,000, rounded to the nearest 10 million = 150,000,000149,100,000, rounded to the nearest 10 million = 150,000,000149,100,000, rounded to the nearest 10 million = 150,000,000
37 rounded to the nearest 10 is 40.
81 million