Explain Addition and Subtraction Strategies
Elementary School Math · Flashcards · Application
ELEMENTARY SCHOOL MATH · FLASHCARDS
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QUESTION
What is
61
−
27
61 - 27
61
−
27
using the idea
61
−
27
=
61
−
20
−
7
61 - 27 = 61 - 20 - 7
61
−
27
=
61
−
20
−
7
?
QUESTION
What is
48
+
19
48 + 19
48
+
19
using compensation:
48
+
19
=
48
+
20
−
1
48 + 19 = 48 + 20 - 1
48
+
19
=
48
+
20
−
1
?
QUESTION
What is
46
+
27
46 + 27
46
+
27
using tens and ones:
(
40
+
6
)
+
(
20
+
7
)
(40+6) + (20+7)
(
40
+
6
)
+
(
20
+
7
)
?
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ANSWER
73
73
73
.
(
40
+
20
)
+
(
6
+
7
)
=
60
+
13
=
73
(40+20)+(6+7)=60+13=73
(
40
+
20
)
+
(
6
+
7
)
=
60
+
13
=
73
by regrouping
13
13
13
as
1
1
1
ten
3
3
3
ones.
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