MAT 103: Rounding
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14 Terms
Why does 5 round up?
Someone decided it a long time ago, and now we all just do it.
If a student shows you that they got the correct answer, but their method only worked coincidentally, what should you do?
Show them a counter example!
What is a counter example?
An example to prove that the student’s method DOESN’T work.
RIRL: A distance is 6.2 miles. What is the range that this distance could actually be in?
Any number between 6.15 and 6.24
RIRL: The population of Billings is 120,000. What is the range that this population could actually be in?
Any number between 115,000 and 124,000.
RIRL: If I have 8 kg of sugar, how much do I actually have?
Any amount between 7.5 and 8.4.
RIRL: If I have 8.0 kg of sugar, how much do I actually have?
Any amount between 7.95 and 8.04.
When rounding, which zero is always being rounded from?
The smallest!
What are two ways fractions can be thought of in?
Equal divisions of a whole
Equal slices of pizza
DEF: The fraction A/B is often read as…
“A out of B equal parts.”
Ex: “1/2 = 1 out of 2 equal parts.”