Using Grids to Subtract Decimals
Lesson
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How do you subtract decimals using a hundredths chart?

Here is how to use a hundredths chart to subtract 0.86 - 0.23


Step 1
Shade 86 squares
(8 columns of 10 squares, plus 6 more)
to show 0.86



Step 2
Using a black crayon,
cross out 23 squares from the shaded squares to show 0.23.



Step 3

Count the squares that are shaded in your hundredths chart,
but not the ones that are crossed out.
How many hundredths are shaded?
Write the decimal for the total number of hundredths squares shaded.

Answer  0.86 - 0.23 = 0.63

 

Example Subtract 1.54 - 0.74


Step 1
Shade 1 grid and 54 squares on another grid to show 1.54.



Step 2
Using a black crayon,
cross out 74 squares from the shaded squares to show 0.74.



Step 3

Count the squares that are shaded in your hundredths chart,
but not the ones that are crossed out.
How many hundredths are shaded?
Write the decimal for the total number of hundredths squares shaded.

Answer  Subtract 1.54 - 0.74 = 0.80

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