<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />

## Add and subtract positive and negative numbers

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

MEMORY METER
This indicates how strong in your memory this concept is
131

MEMORY METER
This indicates how strong in your memory this concept is
12

MEMORY METER
This indicates how strong in your memory this concept is
0

## 정수의 덧셈: 수직선과 덧셈의 특성

MEMORY METER
This indicates how strong in your memory this concept is
1

MEMORY METER
This indicates how strong in your memory this concept is
2

Find the sum of positive and negative integers.
MEMORY METER
This indicates how strong in your memory this concept is
0

## Raj 4 Addition of Integers-DEC12mats

MEMORY METER
This indicates how strong in your memory this concept is
0
• PLIX

## Addition of Integers: Polka Dots

MEMORY METER
This indicates how strong in your memory this concept is
0
• PLIX

MEMORY METER
This indicates how strong in your memory this concept is
0
• PLIX

## The Secret of Subtraction

MEMORY METER
This indicates how strong in your memory this concept is
0
• PLIX

## Adding Between 10 and -10

MEMORY METER
This indicates how strong in your memory this concept is
0
• PLIX

## Addition of Integers: Number Blocks

MEMORY METER
This indicates how strong in your memory this concept is
0

MEMORY METER
This indicates how strong in your memory this concept is
4
• 76
• Critical Thinking