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Q: How do you show your work for two fifths plus three tenths?

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100/5 =20 20x3=60 is a simple way.

You write the number 3 over the number 10, and a horizontal line in between.

abc.def I use letters to show the meaning of placeholders in the Arabic decimal fraction system. "c" is the in units place. Five is just 5 on its own. "bc" is in the tens and the units places, 25 for example, twenty plus five. "abc" is in the hundreds place plus the tens place plus the units place. say 325. on the right hand side of the decimal place we start with ... "0.d" or the tenths position. so three tenths is 0.3 "0.de" would be a number of tenths plus a number of hundredths, say 0.38 JCF

If 3.8 was rewritten to show tenths and hundredths?

Nine tenths of one percent = 0.009

0.9

It is 8.0 : the trailing 0 is necessary to show that it has been rounded to the nearest tenths.

get a ruler

That is it 6 hundredths, not six tenths.

Convert to a common denominator; convert to decimal; compare denominators (larger denominator = smaller fraction, if the numerator is the same).

No. In that case it is 0.0

18.64 rounded to the nearest tenth is 18.6

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