740
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It is 740.
Most schools wrongly teach you to always round 5 up (so the answer would be 750) but, while this is a simple rule to teach, it is not really correct. Under this rule:
• if the following digit is 0 you don't round;
• if the following digit is 1, 2, 3 or 4 you round down; and
• if the following digit is 5, 6, 7, 8 or 9 you round up.
As a result you are more likely to round up than round down and that introduces an upward bias into your calculations.
The IEEE (Institute of Electronic and Electrical Engineers) standard 754 is to round 5 up or down so that the new last digit is even. See link for more: //en.wikipedia.org/wiki/Rounding#Round_half_to_even
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 to the nearest 10, which means 745 rounded to the nearest 10 is 740.
Well, darling, 745 rounded to the nearest 10 is 750. You're just moving that last digit up or down depending on if it's 5 or greater. Easy peasy lemon squeezy.
Oh, dude, like, 745 rounded to the nearest 10 is 750. You know, because 745 is closer to 750 than it is to 740. So, yeah, it's like basic math stuff, no big deal.
10 because 8 is to small to have this and 10 is the first ten there is
Rounded to the nearest ten it is 10 but rounded to the nearest tenth it is 12.6
70
570
30