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The difference is \ \

Place value chart for 3.5 and.

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line up the decimal points and draw a line below the numbers.

Annex zero to align the numbers.        

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First find the difference of the tenths digit.

Notice that it is not possible to subtract 9 tenths from 5 tenths, so 1 unit must be borrowed from ones column.

The difference of the tenths digit.

Next find the difference of the tenths digit.

The difference of the tenths digit .

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The difference is 1.6.