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2. How to Use the “Make a Ten” Strategy to Add
Dawn Galente, Arlington CSD 2011
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3. The “Make a Ten” strategy is a helpful way to solve addition problems when one addend is close to a ten. Changing the number to 10 + ? makes it easier.
EXAMPLE: = ?
We can move 2 counters from the 6 to the 8. 8
This makes the new problem
The fancy name for this strategy is the associative property of addition… we can change the way we group(associate) numbers in an addition problem as long as we don’t change the original total. 6 10 4
First the 2 and the 4 are grouped together
8 + 6 =
8 + (2 + 4) =
(8 + 2) + 4 =
= 14
= 14
Now the 8 and the 2 are grouped together to get our 10

4. The “Make a Ten” strategy can also be used with larger numbers.
EXAMPLE: = ?
We can move 1 counter from the 18 to the 29.
This makes the new problem
(We could also have moved two counters from the 29 to the 18 to make Either way works!) = = 47
EXAMPLE: = ? 3
297
264 +
300 +
261
= 561

5. The End