Oh, dude, rounding to the nearest 10 is like basic math, right? So, for 843, you just look at the digit in the tens place, which is 4. Since 4 is less than 5, you keep it as it is, making it 840. Easy peasy lemon squeezy!
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If the last digit is less than 5 then round down otherwise round up. In this case 3 is less than 5 so 843 becomes 840
Round 42,199,279 to the nearest 10 million.
To round 12 to the nearest 10, you look at the digit in the tens place, which is 1. Since 1 is less than 5, you round down. Therefore, rounding 12 to the nearest 10 gives you 10.
It would stay the same
96 round to the nearest ten=100
10