A sheet on the commutative property, taught here as turn-around facts, with doubles woven through. Students add double dominoes from 3 + 3 upward, write the turn-around partner for facts like 2 + 5 = 7, draw lines between turn-around twins, and finish with a mixed challenge that opens on 7 + 7 and 8 + 8. A callout states the rule in student language: same addends, different order, same total.
1.OA.3
“Apply properties of operations as strategies to add and subtract.”
The whole sheet is the commutative property in student language: every turn-around pair keeps the same total.
1.OA.6
“Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8+ 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13- 3 - 1 = 10 − 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).”
Doubles from 3 + 3 to 8 + 8 build the anchor facts the near-doubles strategy depends on.
Domino pictures show matching dot counts on each side. Students add them, from 3 + 3 through 6 + 6.
Four facts to flip: given 2 + 5 = 7, students write the turn-around in the box, then repeat for 6 + 3, 4 + 1 and 7 + 2.
Lines connect each fact to its twin, so 3 + 5 = 8 pairs with 5 + 3 = 8 and 8 + 2 = 10 pairs with 2 + 8 = 10.
A mixed grid of problems beginning with 7 + 7 and 8 + 8.
Introduce with dominoes
Hand out real dominoes for Part 1 before anyone writes. Turning a domino around makes the property physical.
Halve the memorization load
Show the class that Part 3 proves each pair is one fact, not two. Knowing 8 + 2 means 2 + 8 comes free.
Quick re-teach
For students who miss Part 2, cover the sum and ask whether flipping the addends could change how many counters are on the table.
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