Lesson 5: Understanding Subtraction of Integers and Other Rational Numbers Example 2: Subtracting a Positive Number a. The teacher leads whole class by modeling an Integer Game example to find the sum of . b. Show that discarding (subtracting) a positive card, which is the same as subtracting a positive number, decreases the value of the hand. or Removing (________________) a positive card changes the score in the same way as _____________ a card whose value 4 2 = − = (−) = 4 2 -2 4 2
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Lesson 5: Understanding Subtraction of Integers and Other
Rational Numbers
Example 2: Subtracting a Positive Number
a. The teacher leads whole class by modeling an Integer Game example to find the sum of .
b. Show that discarding (subtracting) a positive card, which is the same as subtracting a positive number, decreases the
value of the hand.
or
Removing (________________) a positive card changes the score in the same way as _____________ a card whose value
4 2
=
− =
(− ) =
4 2 -2
4 2
is the ________________________ _______________________ (or opposite). In this case, adding the corresponding