3rd Grade Math Worksheets: Addition

Free addition worksheets from K5 Learning

Our 3rd grade addition worksheets include both "mental addition problems" intended for students to solve in their heads and multi-digit column form addition questions giving practice in computational skills.  

Mental Addition

 

 

Example

Add a 1-digit number to a 2-digit number
  94 + 7 = ___
Add a 1-digit number to a 2-digit number (missing addend)   91 + ___ = 96
Complete one hundred (missing addend)   ___ + 85 = 100
   
Adding one 2-digit and two 1-digit numbers   4 + 2 + 17 =
Adding a 3-digit number and a 1-digit number
  865 + 5 = ___
     
Whole tens    
Add whole tens to two 2-digit numbers   20 + 39 = ___
Add whole tens to 2-digit numbers (missing addend)   90 + ___ = 141

 
Adding two whole tens and two 1-digit numbers   70 + 7 = 8 + 10 =
Adding whole tens (3 addends)
  60 + 50 + 40 = ___
Adding whole tens (4 addends)
  40+10+10+60= ___
     
Whole hundreds    
Adding whole hundreds (2 addends)   300 + 100 = ___
Adding whole hundreds (3 addends)   200+100+700 = ___
Adding whole hundreds (missing addend)   ___ + 900 = 1800
Adding to complete whole thousands   7300 + ___ = 9000 
     
 Whole thousands:
   
Adding whole thousands and whole hundreds   7100 + 300 =
Adding whole thousands to another number   6349 + 4000 = ___

Column-form addition

 
Adding two 2-digit numbers, no carrying

 

22

+ 23


Adding two 2-digit numbers

 

38

+ 27


Adding two 3-digit numbers, no carrying

 

123

+ 234


Adding two 3-digit numbers  

216

+ 955


Adding three 3-digit numbers

 

342

+ 123

+ 456


Adding four 3-digit numbers

 

456

+ 123

+ 567

+ 890


Adding two 4-digit numbers

 

5,432

+ 1,543


Adding three 4-digit numbers

 

9,002

+ 1,004

+ 2,567


Adding four 4-digit numbers

 

1,111

+ 2,222

+ 3,333

+ 4,444


Addition word problems

   
Grade 3 addition word problems    

Grade 3 Addition Worksheet Printable

Sample Grade 3 Addition Worksheet

More addition worksheets

Find all of our addition worksheets, from adding by counting objects  to addition of multiple large numbers in columns.

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