Numbers that round to 80 are those that fall between 75 and 84. When rounding to the nearest ten, any number 75 to 84 will round to 80. This is because the midpoint between 75 and 84 is 79.5, which rounds up to 80. Therefore, the numbers that round to 80 are 75, 76, 77, 78, 79, 80, 81, 82, 83, and 84.
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24
All even numbers between 50 and 80 are composite.
45 to 54
71, 73, 79
All numbers greater than or equal to 0.5 and less than 1.5.