There are 64 tens in 640. This is because each place value to the left of the decimal point represents a power of 10, with the tens place being the second digit from the right. In the number 640, the digit 6 is in the hundreds place, indicating 6 sets of 100 (or 10^2), and thus there are 64 sets of 10 (or 10^1) in 640.
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The place value of 4 is TENS and so its value is 4 lots of ten or forty.
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There are 640 acres in a section.
640 grams = 22.57ounces.
640 ounces = 40 pounds
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How many tens are there in 1700?
640 ÷ 8 = 80.