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To write 4 ones and 13 tenths as a decimal, you simply add the two parts together. 4 ones is equivalent to 4, and 13 tenths is equivalent to 0.13. Adding these together gives you 4.13 as the decimal representation of 4 ones and 13 tenths.
4
1+1+1+1 = 4 = 40 tenths = 400 hundredths
4 +30=40
10 tenths make one whole thus 40 tenths = 4 x 10 tenths = 4 x one whole = four.