What this lesson shows
Fixes a mistake
Two pieces of different sizes are not halves.
The worked example
The lesson works this one step by step: rectangle (question 1). Then your kid tries one like it on paper.
The steps
- Two pieces
- Same size?
- Only equal parts are halves
Helping at home
Halves must be the same size. Fold the pieces on top of each other: if they match, they are halves.
If your kid gets stuck
Do the two parts match?
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.G.A.3
Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares. - Common Core 2.G.A.3
Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.
Matches standards in 50 statesSee each state's code
- Alabama MA19.1.23a, MA19.1.23b, MA19.2.27a
- Alaska 1.G.3, 2.G.3
- Arizona 1.G.A.3, 2.G.A.3
- Arkansas 1.NPV.8, 2.NPV.6, 2.NPV.7
- California 1.G.A.3, 2.G.A.3
- Colorado 1.G.A.3, 2.G.A.3
- Connecticut 1.G.A.3, 2.G.A.3
- Delaware 1.G.A.3, 2.G.A.3
- District of Columbia 1.G.A.3, 2.G.A.3
- Florida MA.1.FR.1.1, MA.2.FR.1.1, MA.2.FR.1.2
- Georgia 1.GSR.4.3, 2.GSR.7.3, 2.GSR.7.4
- Hawaii 1.G.A.3, 2.G.A.3
- Idaho 1.G.A.3.a, 1.G.A.3.b, 2.G.A.3.a, 2.G.A.3.b, 2.G.A.3.c
- Illinois 1.G.A.3, 2.G.A.3
- Indiana 1.G.3, 2.G.4
- Iowa 1.G.A.3, 2.G.A.3
- Kansas 1.G.3, 2.G.3
- Kentucky KY.1.G.3, KY.2.G.3
- Louisiana 1.G.A.3, 2.G.A.3
- Maine 1.G.A.3, 2.G.A.3
- Maryland 1.NOS.F.14, 2.NOS.D.11
- Massachusetts 1.G.A.3, 2.G.A.3
- Michigan 1.G.A.3, 2.G.A.3
- Mississippi 1.G.3, 2.G.3
- Missouri 1.GM.A.4, 2.GM.A.3.a
- Montana MT.1.G.4, MT.2.G.3
- Nebraska 1.G.1.d, 2.G.1.d, 2.G.1.e
- Nevada 1.G.A.3, 2.G.A.3
- New Hampshire 1.G.A.3, 2.G.A.3
- New Jersey 1.G.A.3, 2.G.A.3
- New Mexico 1.G.A.3, 2.G.A.3
- New York NY-1.G.3, NY-2.G.3
- North Carolina NC.1.G.3.a, NC.1.G.3.b, NC.1.G.3.c, NC.2.G.3.a, NC.2.G.3.b, NC.2.G.3.c
- North Dakota 1.NO.NF.1, 2.NO.NF.3, 2.NO.NF.1, 2.NO.NF.2
- Ohio 1.G.3, 2.G.3
- Oklahoma 1.N.3.1, 2.N.3.1, 2.N.3.2
- Oregon 1.GM.A.3, 2.GM.A.3
- Pennsylvania CC.2.3.1.A.2, CC.2.3.2.A.2
- Rhode Island 1.G.A.3, 2.G.A.3
- South Carolina 1.NR.4.1, 2.NR.4.2, 2.NR.4.1
- South Dakota 1.G.A.3, 2.G.A.3
- Tennessee 1.G.A.3, 2.G.A.3, 3.G.A.2
- Texas 111.3.b.6.G, 111.3.b.6.H, 111.4.b.3.A, 111.4.b.3.D, 111.4.b.8.E, 111.5.b.6.E
- Utah 1.G.3, 2.G.3
- Vermont 1.G.A.3, 2.G.A.3
- Virginia 1.NS.3a, 1.NS.3b, 1.NS.3c, 2.NS.3a, 2.NS.3e.i
- Washington 1.G.A.3, 2.G.A.3
- West Virginia M.1.22, M.2.27
- Wisconsin M.1.G.A.3, M.2.G.A.3
- Wyoming 1.G.3a, 1.G.3b, 1.G.3c, 1.GP.3.A, 1.GP.3.B, 1.GP.3.C, 2.G.3a, 2.G.3b, 2.G.3c, 2.GP.3.A, 2.GP.3.B, 2.GP.3.C