40
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Ah, rounding numbers can be a happy little adventure! When we round 42 to the nearest 10, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we keep the tens digit the same and change the ones digit to 0. So, 42 rounded to the nearest 10 is 40.
Oh, dude, 42 rounded to the nearest 10 is like 40. I mean, it's not rocket science, right? Just take a quick look at the number line and you'll see it's closer to 40 than 50. Math can be chill sometimes, you know?
When rounding a number to the nearest 10, you look at the digit in the tens place. In this case, the digit in the tens place is 4. Since 4 is less than 5, you round down. Therefore, 42 rounded to the nearest 10 is 40.