Page 4 - Kindergarten.indd

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Core skills 1

1.OA.1: Use addition and subtraction within 20 to solve word problems involving situations
of adding to, taking from, putting together, taking apart, and comparing, with unknowns in
all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown
number to represent the problem.

A plus sign (+) in an addition sentence indicates that the numbers are added, joined
or combined together.

2 + 3 = 5 4 + 5 = 8

THINK THINK
Use drawings to represent the number Use drawings to represent the number
sentence. sentence.
+ +

Counting the total number of dots, we can Counting the total number of dots, we can
see that there are 5 dots. Therefore, the see that there are 9 dots. Therefore, the
addition sentence is CORRECT! addition sentence is NOT CORRECT!

Place a check mark () in the box if the statement is CORRECT and an X in the box () if the
addition sentence is NOT CORRECT. Use scrap paper to make your dots.

1. 2.
2 + 4 = 6 1 + 1 = 4

3 + 1 = 6 2 + 2 = 4

1 + 5 = 6 3 + 3 = 4

3. 4.
1 + 3 = 8 4 + 3 = 7

2 + 4 = 8 5 + 2 = 7

3 + 5 = 8 6 + 1 = 7

MATH BOOT CAMP SMART TO THE CORE | J & J Educational Boot Camp, Inc. 3