What this lesson shows
3 + 9 + 4 and 9 + 4 + 3 in cubes. Same numbers, same total: 16.
The worked example
The lesson works this one step by step: 3 + 9 + 4. Then your kid tries one like it on paper.
The steps
- Add in one order
- Add in another order
- Same total
Helping at home
Add the three numbers in any order you like. Try two orders and see the total stay the same. Cubes or drawings help.
If your kid gets stuck
Pick the easiest order.
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.
Standards
- Common Core 1.OA.B.3
Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)
Matches standards in 48 statesSee each state's code
- Alabama MA19.1.3
- Alaska 1.OA.3
- Arizona 1.OA.B.3
- Arkansas 1.CAR.3
- California 1.OA.B.3
- Colorado 1.OA.B.3
- Connecticut 1.OA.B.3
- Delaware 1.OA.B.3
- District of Columbia 1.OA.B.3
- Florida MA.1.AR.1.1
- Georgia 1.NR.2.7
- Hawaii 1.OA.B.3
- Idaho 1.OA.A.2, 1.OA.B.3
- Illinois 1.OA.B.3
- Indiana 2.CA.3
- Iowa 1.OA.B.3
- Kansas 1.OA.3
- Kentucky KY.1.OA.3
- Louisiana 1.OA.B.3
- Maine 1.OA.B.3
- Maryland 1.NOS.C.7, 1.NOS.E.10.c
- Massachusetts 1.OA.B.3
- Michigan 1.OA.B.3
- Mississippi 1.OA.3
- Missouri 1.RA.B.5
- Montana MT.K.OA.6, MT.1.OA.2
- Nebraska 1.N.5.d, 1.N.5.e
- Nevada 1.OA.B.3
- New Hampshire 1.OA.B.3
- New Jersey 1.OA.B.3
- New Mexico 1.OA.B.3
- New York NY-1.OA.2, NY-1.OA.3
- North Carolina NC.1.OA.3
- Ohio 1.OA.2, 1.OA.3
- Oklahoma 2.A.2.3, 3.A.2.2
- Oregon 1.OA.A.2, 1.OA.B.3
- Pennsylvania CC.2.2.1.A.2
- Rhode Island 1.OA.B.3
- South Carolina 2.PAFR.1.6, 1.PAFR.1.5
- South Dakota 1.OA.B.3
- Tennessee 1.OA.A.2, 1.OA.B.3
- Texas 111.3.b.3.C, 111.3.b.5.G
- Utah 1.OA.3
- Vermont 1.OA.B.3
- Virginia 2.CE.1f
- Washington 1.OA.B.3
- West Virginia M.1.3
- Wisconsin M.1.OA.B.3