# Subtraction Really is Addition (3-9 thru 3-15) 1st and 2nd Graders

Posted on March 13th, 2010 by kramer

### In the 1st and 2nd grade classes this week, we reinforced the notion that subtraction really is addition. For example, 12-8=4 is the opposite as 8+4=12; 101-98 is really the same as 2+1=3. What do we have to add to 98 to get to 101. Also, 85-48 is 2+30+5=37.

<!--StartFragment--> <!--EndFragment-->

### Also, we worked on subtraction as compared to negative numbers. For example 11-7=4 is the same as -7 + 11 = 4.

### There is a detailed explanation of these concepts in the attached pdf as well as additional practice.

### Some of the Mathletes who finished their worksheet were given an advance addition and subtraction worksheet with integers and decimals. This is intended to be completed with parental guidance.

Attachment | Size |
---|---|

Subraction_Really_is_Addition.pdf | 310.26 KB |