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Adding integers (block models)
供稿人: Smith
These blocks total +4
Each  blue block
represents +1
+3
+2
These blocks total +5
     (+2)+(+3)=+5
+1
+4
These blocks total +5
     (+4)+(+1)=+5
+5
+
4
 −1
−9
+1
+9
+5
+
3
 −2
−8
+2
+8
These blocks total -4
Each red block
represents -1
-3
-2
These blocks total -5
     (-2)+(-3)=-5
-1
-4
These blocks total -5
     (-4)+(-1)=-5
-
−5
4
 −1
−9
+9
+1
-
−5
2
−3
−7
+3
+7
-
−5
3
−2
−8
+2
+8
-
−4
4
 0
−8
+8
+4
-
−4
2
−2
−6
+2
+6
+3
-3
When the amount of blue and red blocks
are equal, the result is ZERO

(+3)+(-3)=0
a
c
All answer choices equal zero except one.
Which choice does NOT equal zero?
d
b
a
c
All answer choices equal zero except one.
Which choice does NOT equal zero?
d
b
a
c
All answer choices equal zero except one.
Which choice does NOT equal zero?
d
b
If there are more blue (positive) blocks
than red (negative) blocks, the result
is POSITIVE
-2
+3
These blocks total +1
     (+3) + (-2) = +1
a
c
All answer choices equal +2 except one.
Which choice does NOT equal +2?
d
b
a
c
All answer choices equal +3 except one.
Which choice does NOT equal +3?
d
b
a
c
All answer choices equal +1 except one.
Which choice does NOT equal +1?
d
b
+
−2
 +2
−2
4
+6
-6
+
−2
 +3
−3
5
+7
-7
−3
+
 +8
−8
5
+2
-2
+3
-5
If there are more red (negative) blocks
than blue (positive) blocks, the result
is NEGATIVE.
These blocks total -2
     (-5) + (+3) = -2
a
c
All answer choices equal -3 except one.
Which choice does NOT equal -3?
d
b
a
c
All answer choices equal -2 except one.
Which choice does NOT equal -2?
d
b
a
c
All answer choices equal -1 except one.
Which choice does NOT equal -1?
d
b
+
−5
 −1
−9
4
+1
+9
+
−5
 −1
−3
2
-2
+3
+
−5
 −1
+1
1
-4
+4
+
−5
 −1
−9
4
+1
+9
finito
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