What this lesson shows
Pair up 9 counters: 4 pairs and 1 left over, so 9 = 4 + 4 + 1 is odd. 8 = 4 + 4 is even.
The worked example
The lesson works this one step by step: 9. Then your kid tries one like it on paper.
The steps
- Pair them up
- Two equal rows
- One left over: odd
- All paired: even
Helping at home
Draw the counters in pairs, one on top of its partner. If every counter has a partner, the number is even. If one is left over, it is odd. Write it as two equal parts, plus 1 if one is left.
If your kid gets stuck
Does every counter have a partner?
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 2.OA.C.3
Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.
Matches standards in 49 statesSee each state's code
- Alabama MA19.2.3a
- Alaska 2.OA.3
- Arizona 2.OA.C.3
- Arkansas 2.CAR.8
- California 2.OA.C.3
- Colorado 2.OA.C.3
- Connecticut 2.OA.C.3
- Delaware 2.OA.C.3
- District of Columbia 2.OA.C.3
- Florida MA.2.AR.3.1
- Georgia 2.NR.3.1
- Hawaii 2.OA.C.3
- Idaho 2.OA.C.3
- Illinois 2.OA.C.3
- Indiana 2.NS.3
- Iowa 2.OA.C.3
- Kansas 2.OA.3
- Kentucky KY.2.OA.3
- Louisiana 2.OA.C.3
- Maine 2.OA.C.3
- Maryland 2.AT.B.3
- Massachusetts 2.OA.C.3
- Michigan 2.OA.C.3
- Mississippi 2.OA.3
- Missouri 2.RA.B.2.b, 2.RA.B.2.c
- Montana MT.2.OA.3
- Nebraska 2.N.5.d
- Nevada 2.OA.C.3
- New Hampshire 2.OA.C.3
- New Jersey 2.OA.C.3
- New Mexico 2.OA.C.3
- New York NY-2.OA.3.a, NY-2.OA.3.b
- North Carolina NC.2.OA.3.a, NC.2.OA.3.b, NC.2.OA.3.c
- North Dakota 2.AR.OA.6
- Ohio 2.OA.3
- Oklahoma 1.N.3.2, 2.N.1.5
- Oregon 2.OA.C.3
- Pennsylvania CC.2.2.2.A.3
- Rhode Island 2.OA.C.3
- South Carolina 2.PAFR.1.8
- South Dakota 2.OA.C.3
- Tennessee 2.OA.C.3
- Texas 111.4.b.7.A
- Utah 2.OA.3
- Vermont 2.OA.C.3
- Virginia 2.NS.1a, 2.NS.1h, 2.NS.1i, 2.NS.1j
- Washington 2.OA.C.3
- West Virginia M.2.4
- Wisconsin M.2.OA.C.3