Contextual Problems for Addition and Subtraction within 20

Name Grade School
Date Questions10 Score

1
If 9 lemons added to the below group, what will be the total number of lemons?
lemonlemonlemonlemon
+
=
2
If 5 chickens added to the below group, what will be the total number of chickens?
hatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chick
+
=
3
If 6 corns added to the below group, what will be the total number of corns?
corncorncorncorncorncorncorncorncorncorn
+
=
4
If 2 flowers added to the below group, what will be the total number of flowers?
blossomblossomblossom
+
=
5
If 2 hats were taken away from the below group, how many hats will be left in the group?
tophattophattophattophattophattophattophattophattophattophattophattophattophattophattophattophattophat
-
=
6
If 1 tomatos added to the below group, what will be the total number of tomatos?
tomatotomatotomatotomatotomato
+
=
7
If 2 grapes added to the below group, what will be the total number of grapes?
grapesgrapesgrapes
+
=
8
If 1 watermelons added to the below group, what will be the total number of watermelons?
watermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelon
+
=
9
If 2 tennis balls added to the below group, what will be the total number of tennis balls?
tennistennistennistennistennistennistennis
+
=
10
If 1 cats added to the below group, what will be the total number of cats?
catcatcatcatcatcatcatcat
+
=

Answers Key
1
If 9 lemons added to the below group, what will be the total number of lemons?
lemonlemonlemonlemon
+
lemonlemonlemonlemonlemonlemonlemonlemonlemon
=
lemonlemonlemonlemonlemonlemonlemonlemonlemonlemonlemonlemonlemon
2
If 5 chickens added to the below group, what will be the total number of chickens?
hatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chick
+
hatched_chickhatched_chickhatched_chickhatched_chickhatched_chick
=
hatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chickhatched_chick
3
If 6 corns added to the below group, what will be the total number of corns?
corncorncorncorncorncorncorncorncorncorn
+
corncorncorncorncorncorn
=
corncorncorncorncorncorncorncorncorncorncorncorncorncorncorncorn
4
If 2 flowers added to the below group, what will be the total number of flowers?
blossomblossomblossom
+
blossomblossom
=
blossomblossomblossomblossomblossom
5
If 2 hats were taken away from the below group, how many hats will be left in the group?
tophattophattophattophattophattophattophattophattophattophattophattophattophattophattophattophattophat
-
tophattophat
=
tophattophattophattophattophattophattophattophattophattophattophattophattophattophattophat
6
If 1 tomatos added to the below group, what will be the total number of tomatos?
tomatotomatotomatotomatotomato
+
tomato
=
tomatotomatotomatotomatotomatotomato
7
If 2 grapes added to the below group, what will be the total number of grapes?
grapesgrapesgrapes
+
grapesgrapes
=
grapesgrapesgrapesgrapesgrapes
8
If 1 watermelons added to the below group, what will be the total number of watermelons?
watermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelon
+
watermelon
=
watermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelonwatermelon
9
If 2 tennis balls added to the below group, what will be the total number of tennis balls?
tennistennistennistennistennistennistennis
+
tennistennis
=
tennistennistennistennistennistennistennistennistennis
10
If 1 cats added to the below group, what will be the total number of cats?
catcatcatcatcatcatcatcat
+
cat
=
catcatcatcatcatcatcatcatcat

Addition and Subtraction within 20 Worksheet

The CCSS.MATH.1.OA.A.1 worksheets with answers for 1st grade students to practice problems on Add and subtract within 20 to solve contextual problems, with unknowns in all positions, involving situations of add to, take from, put together/take apart, and compare by 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.1 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 1OAA1 worksheets, students are required to add and subtract within 20 to solve contextual problems, with unknowns in all positions, involving situations of add to, take from, put together/take apart, and compare. Users can directly refer the answer key to verify the work with steps for the corresponding practice problems given in the 1.OA.A.1 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.1 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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