Page 40 - Maths Class 03

Look at some more examples :

You might be given a list of ten numbers. We find it easier to break down

the number of addends. Instead of trying to add these ten numbers
together at one time, you might want to add two numbers, then three

numbers, and then the remaining three numbers. In the last step, you add

those three temporary sums together.

For example : 15 + 26 + 34 + 45 + 19 + 22 + 44 = ?

Think of it this way...

(15 + 26) + (34 + 45) + 19 + (22 + 44) = ?

1. Add smaller groups together.

15 + 26 = 41

34 + 45 = 79

22 + 44 = 66

and there is a 19 sitting there.

You now have 41 + 79 + 66 + 19 = ?

2. Add those temporary sums together.

41 + 19 = 60

79 + 66 = 145

3. Finish it off by adding those values.

60 + 145 = 205

Can you see how it’s not as big of a problem when you break it down into

smaller pieces ? You can tackle one hundred addends in a problem if you try
that grouping strategy. When you get a problem that is complicated, just

take a moment to look for patterns or ways to break it down into simpler

ideas.

Use Your Tools

All you need to remember is that if you are only adding terms, you can

reorder and group any time you want to make the problem easier to solve.

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