1. Adding with the Base Ten System http://www.vectorstock.com/royalty-free-vector/rainbow-background-vector-580934

2. http://www.vectorstock.com/royalty-free-vector/set-of-cartoon-number-vector-472670

4. EVERY number is made up of the same 10 digits http://www.vectorstock.com/royalty-free-vector/set-of-cartoon-number-vector-472670

6. We can break the number up by each digit's value, called Place Value http://www.coolmath.com/prealgebra/02-decimals/01-decimals-place-value-01.htm

8. When we add numbers we need to line up them by place value. Becomes.... The tens are lined up with the tens The ones are lined up with the ones http://www.coolmath4kids.com/addition/05-addition-lesson-two-digit-numbers-01.html

10. +

11. + First combine all of the similar sized manipulatives (ones with ones, tens and tens, etc)

13. 17 ones becomes one 10 and 7 ones =

14. 5 tens is 50

15. So then we ADD our 5 tens and our one 10 and seven 1s +

16. It becomes 6 tens and 7 ones, which is the same as 67

17. How can we add two double-digit numbers without math blocks?

20. http://www.coolmath4kids.com/addition/05-addition-lesson-two-digit-numbers-01.html

22. Now let's practice adding double-digit numbers using both ways!