When you add two numbers together, you find how many you have in all. 
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The numbers you add are called addends. The result you get on adding is called the sum or the total of these addends. The sign of addition is " + ", and is read as "plus". There are different ways to read and write addition sentences. Different ways of writing : Types of addition : 1. Addition without regrouping. 1. Addition without regrouping: Luke and Tara were playing a video game. Luke scored 137 points and
Tara 142 points. How many points did they score in all? 3. Add tens.
4. Add hundreds.
Luke and Tara scored 283 points together. 

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