Name
Date

1
+ 1 + 10 = 19
+
+
=
2
4 + 11 + = 17
+
+
=
3
8 + 6 + 5 =
+
+
=
4
+ 2 + 5 = 16
+
+
=
5
6 + + 2 = 19
+
+
=
6
+ 4 + 1 = 7
+
+
=
7
9 + + 1 = 12
+
+
=
8
2 + 8 + 10 =
+
+
=
9
4 + 2 + = 17
+
+
=
10
+ 16 + 2 = 19
+
+
=

Answers Key
1
8 + 1 + 10 = 19
+
+
=
2
4 + 11 + 2 = 17
+
+
=
3
8 + 6 + 5 = 19
+
+
=
4
9 + 2 + 5 = 16
+
+
=
5
6 + 11 + 2 = 19
+
+
=
6
2 + 4 + 1 = 7
+
+
=
7
9 + 2 + 1 = 12
+
+
=
8
2 + 8 + 10 = 20
+
+
=
9
4 + 2 + 11 = 17
+
+
=
10
1 + 16 + 2 = 19
+
+
=

# Add 3 Whole Numbers Whose Sum is within 20 Worksheet

The CCSS.MATH.1.OA.A.2 worksheets with answers for 1st grade students to practice problems on Add three whole numbers whose sum is within 20 to solve contextual problems using objects, drawings, and equations with a symbol for the unknown number to represent the problem is available online for free in printable and downloadable (pdf & image) format. For more questions and answers on 1.OA.A.2 math activities, tap on generate new worksheet to learn, practice, test and verify math skills under the common core cluster (1OAA) represent and solve problems involving addition and subtraction in domain operations and algebraic thinking.

How to Use this Worksheet

Objective
To practice these math problems of 1OAA2 worksheets, students are required to add three whole numbers whose sum is within 20 to solve contextual problems using objects, drawings, and equations with a symbol for the unknown number to represent the problem. Users can directly refer the answer key to verify the work with steps for the corresponding practice problems given in the 1.OA.A.2 activities under the domain operations and algebraic thinking in common core state standards for 1st grade mathematics. The main objective of these 1.OA.A.2 practice problems and answers is to make students to understand how to (1OAA) represent and solve problems involving addition and subtraction.

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