Addition and Subtraction: Knowledge (Place Value)

KNOWLEDGE: PLACE VALUE

HUNDREDS, TENS AND ONES

Check your understanding of place value with these materials.  

BASE TEN BLOCKS

1. Add 4 + 5 and check the answer.  
2. Then try 40 + 50 and check the answer.  

ADDITION CHECKER

"Try 20 plus 20.  How about 30 + 20?  What did you find out?"