0
The easiest way to solve this is to write out 309 million:
309,000,000
Next, identify the ten million's place. In this case, it is the 0 between 3 and 9. Then determine if the number to the right of this 0 is 5 or greater. In this case, it is a 9, meaning you would round up to 10 million. So, the answer is 310,000,000.
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Continue Learning about Math & Arithmetic
What is 2933888000 rounded to the ten million?
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