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Divide an Odd Whole Number Mixed Fraction by Two

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This Makes Fractions Stupid Easy

What happens here

The next scenario addresses finding half of a mixed number with an odd whole number, using '19 3/8' as an example. To simplify, the whole number '19' is first 'bumped down' to '18'. This '18' is then divided by '2', yielding '9'. To handle the remaining part from the odd whole number, the original numerator '3' and the original denominator '8' are added together, resulting in a new numerator '11'. The original denominator '8' is again multiplied by '2' to get a new denominator '16'. Combining these steps, half of '19 3/8' is '9 11/16'. The process of bumping down the whole number by one and incorporating that value into the fraction by adding the numerator and denominator is key here.

Goal: Find half of a mixed number where the whole number is odd.

Tools and materials

  • Marker — Writing down the numbers and calculations on the whiteboard
  • Whiteboard Unbranded — Visual demonstration of the calculation steps
  • Mixed Number — The fraction being divided

What they say

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Now, what if that was an odd number? Let's run it. So, that's an odd number. Let's say uh 19 and 3/8. Bump this 19 down to an 18. You ain't got to be weird about it. Let's divide by two. That gives us nine. This is where shit's going to get kind of froggy. So, 3 + 8 is 11. Take that little guy. Multiply it by two. Give yourself 16. So, half of 19 and 3/8 is 9 and 11/16. Follow for more.

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