177 - 77 = 100
To write the numbers from 1 to 20, we need to count the digits used for each range. The numbers 1 to 9 use 1 digit each, totaling 9 digits. The numbers 10 to 20 use 2 digits each, totaling 22 digits (11 numbers). Therefore, the total number of digits required to write all the numbers from 1 to 20 is 9 + 22 = 31 digits.
Write the general algebraic expression for each using matchstick?
0.0001
3,810
Standard form
You write it out with less digits but will be able to get the same answer. Example: 9(x+3)=9x+27
7,200,000,000
1.025
a cheque
5.55
6,000,054
6,006,000,000