430
If the number on the end is 5 or more then you round up (in this case 6). If it was less than 5 you would round down to 420.
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When rounding 426 to the nearest ten, you look at the digit in the tens place, which is 2. Since 2 is less than 5, you round down. Therefore, 426 rounded to the nearest ten is 420.
Well, honey, 426 rounded to the nearest ten is 430. It's not rocket science, just bump that 6 up to a 10 and you're good to go. Math doesn't have to be a headache, darling.