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## Adding Two Digit Numbers

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**Adding Two Digit Numbers**Susie Wellert Wellert Link Page Northern Michigan University**Adding Multiples of Ten**This is how we show 10+10=20: Each bundle of sticks equals 10 so two bundles of 10 equals 20.**Continued**Here is another way that we can show 10+10=20: Click here for some practice.**Expanded Form**What number is this? It is the number 34. We are going to write 34 in a new way now. How many are in the tens? There are 3 tens, that equals 30. Plus how many ones? There are 4 ones. When you add them together they make 34.**Expanded Form Continued**So now we can write 34 in a new way… 34 = 3 tens + 4 34 = 30 + 4 34 = 30 + 4 is called expanded form. Click here to do a worksheet for practice.**Simplest Form**Do you know what the simplest name is for the answer to this: 40 + 7 = ___ The simplest name is 47.**Putting It All Together**Now we have all the pieces that we need to add two digit numbers. Just follow the example below: All you have to do is add the bundles of sticks together then add the tally marks together to find how many are in all.**Now you know how to add two digit numbers!! Click here to**take the quiz. To check your answers click on each of these, worksheet1, worksheet2 and the quiz.