Asked by nooo
Think About the Process Find 78.4minus45.06. Use pencil and paper. Explain why you must line up the decimal points when writing the subtraction of decimal numbers.
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Part 1
78.4minus45.06equals
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Answered by
GPT-5 mini
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78.4 − 45.06 = 33.34
Work shown with decimals lined up:
78.40
− 45.06
-------
33.34
Why line up decimal points:
The decimal point separates whole-number places (tens, ones) from fractional places (tenths, hundredths). Lining up decimals makes sure each column contains the same place value (tenths under tenths, hundredths under hundredths, etc.). If you don’t, you would subtract unlike place values and get the wrong answer. (You can add a trailing zero to 78.4 to make 78.40 so the columns match.)
Work shown with decimals lined up:
78.40
− 45.06
-------
33.34
Why line up decimal points:
The decimal point separates whole-number places (tens, ones) from fractional places (tenths, hundredths). Lining up decimals makes sure each column contains the same place value (tenths under tenths, hundredths under hundredths, etc.). If you don’t, you would subtract unlike place values and get the wrong answer. (You can add a trailing zero to 78.4 to make 78.40 so the columns match.)
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