70
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When rounding 72.4 to the nearest 10, you look at the digit in the tens place, which is 7. Since the digit to the right of it is 2, which is less than 5, you round down. Therefore, 72.4 rounded to the nearest 10 is 70.
Well, let's take a moment to appreciate the number 72.4. When we round it to the nearest 10, it becomes 70. Sometimes in life, we just need a little rounding to feel more at ease.