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Subtracting Multi-Decimals

Directions: Use the digits 1 to 9, at most one time each, to fill in the boxes so that the difference is as close to 50 as possible. NOTE: The digits used in the difference can be repeated.

Hint

Hint

What digit could go in the tens place to be close to 50?

Answer

Answer

53.1 – 2.9 = 50.2
52.9 – 3.1 = 49.8

Source: Giselle Garica

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4 comments

  1. If the answer is correct then there are too many boxes in the second number for the setup of the problem. What you are suggesting is that it is a 2 digit number with a decimal subtracted by another 2 digit number with a decimal. If you want to fix that the “setup” it should look like this ..

    [][].[] – [].[] = ?

    Otherwise, the answer key is wrong and should be something like this:
    75.1 – 24.9 = 50.2
    OR
    73.9 – 24.1 = 49.8

  2. I told my students they could use 0-9 and then the second number being 3 digits was was ok. Here’s what they came up with:
    73.9 – 24.0 = 49.9
    74.0 – 23.9 = 50.1

  3. My students argued that the directions didn’t specify that digits had to be positive and were able to make exactly 50 with a couple of different combinations:)

    35.2-(-14.8)
    34.2-(-15.8)
    32.4-(-17.6)

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