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1. Think of the easiest order in which to add the three numbers in each box. (Hint: Add the two numbers that add up to a multiple of 10 first.)
2. Write the number sentence to show the order and the sum. The first one is done for you.
 11 19 15   19+11+15 = 45 18 12 24   18+12+24 = 54 17 33 21   33+17+21 = 71 23 42 17   23+17+42 = 82 28 33 2   28+2+33 = 63 13 26 24   26+24+13 = 63 27 33 26   33+27+26 = 86 15 21 45   45+15+21 = 81 11 47 19   19+11+47 = 77

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### Related Resources

The various resources listed below are aligned to the same standard, (2NBT06) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtraction Worksheet shown above.

Add up to four two-digit numbers using strategies based on place value and properties of operations.

#### Worksheet

##### Three or more

Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

Use place value understanding and properties of operations to add and subtract

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