20
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You can subtract 10 from 100 ten times before reaching zero. Each subtraction reduces the number by 10, so after ten subtractions, you will have 100 - (10 * 10) = 0. Therefore, you can subtract 10 from 100 ten times in total.
1,900,000,000,000,000,000,000,000,000.
To find a number that is ten times smaller than 29, you would divide 29 by 10. This calculation results in 2.9. Therefore, 2.9 is the number that is ten times smaller than 29.
-10-18x
10 times for the one's digit, 1-100 10 times for the ten's digit, 60-70 = 20 times