The ten millions digit is the 4, so you look behind it to see which way to round. There is a 2 so you will round down.
Therefore the answer is 40,000,000
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42199279 to the nearest ten million is 40 million. This is because the digit in the ten million place is 4, which is less than 5. Therefore, we round down to the nearest ten million.
Round 42,199,279 to the nearest 10 million.
651,032,781 rounded to the nearest ten million is 651,000,000.
Rounded to the nearest ten million, 67,200,000 is approximately equal to 70,000,000.
409,381,886 = 410 million