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Subtracting Decimals (Elementary)

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) difference.

Hint

Hint

What number does each box represent?

Answer

Answer

No answers yet.  If you have one, post it in the comments.

Source: Robert Kaplinsky

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8 comments

  1. My fourth grade students came up with 0.14 is the smallest difference. This could be achieved by a few different ways. However, the tenths and hundredths had to be ___.12 – ___.98

  2. We thought about negative numbers. My class came up with -9.36 if you consider negative numbers.

    • I’m rethinking our logic now. The smallest difference would mean show two numbers that are as close as possible on a number line.

  3. My fifth graders also got .14 as the smallest difference, but we did it using the digits 1-9. Both 4.12-3.98 and 5.12-4.98 can give you this result.

    They also figured 9.87-1.23 = 8.64 as the largest difference.

  4. My 4/5th grade students also got 0.14 several ways using _.12-_.98= 0.14. We did not use negative numbers.

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