The written-out form is "one hundred twenty."
Colloquially, many will say "one hundred and twenty." But technically the conjunction and would be reserved for the decimal part of the number, if any, e.g. "one hundred twenty and a half." It often comes down to what sounds natural when expressing the number.
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120
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120
After 119 comes 120. In the decimal number system, each number increases by one as you move along the number line. So, after 119, the next number is 120.
120% 0f 70 is 84