What this lesson shows
A square cake cut into 4 rectangles, then into 4 triangles. Both ways make fourths.
The worked example
The lesson works this one step by step: square cake (question 1). Then your kid tries one like it on paper.
The steps
- Cut into 4 rectangles: fourths
- Cut into 4 triangles: fourths
- Different shapes, same size
Helping at home
Cut two paper squares the same size into fourths, one into strips and one corner to corner. Lay a strip on two triangles: each part is one fourth of the same square.
If your kid gets stuck
Are the parts the same size?
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.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 MA19.2.27a
- Alaska 2.G.3
- Arizona 2.G.A.3
- Arkansas 2.NPV.6, 2.NPV.7
- California 2.G.A.3
- Colorado 2.G.A.3
- Connecticut 2.G.A.3
- Delaware 2.G.A.3
- District of Columbia 2.G.A.3
- Florida MA.2.FR.1.1, MA.2.FR.1.2
- Georgia 2.GSR.7.3, 2.GSR.7.4
- Hawaii 2.G.A.3
- Idaho 2.G.A.3.a, 2.G.A.3.b, 2.G.A.3.c
- Illinois 2.G.A.3
- Indiana 2.G.4
- Iowa 2.G.A.3
- Kansas 2.G.3
- Kentucky KY.2.G.3
- Louisiana 2.G.A.3
- Maine 2.G.A.3
- Maryland 2.NOS.D.11
- Massachusetts 2.G.A.3
- Michigan 2.G.A.3
- Mississippi 2.G.3
- Missouri 2.GM.A.3.a
- Montana MT.2.G.3
- Nebraska 2.G.1.d, 2.G.1.e
- Nevada 2.G.A.3
- New Hampshire 2.G.A.3
- New Jersey 2.G.A.3
- New Mexico 2.G.A.3
- New York NY-2.G.3
- North Carolina NC.2.G.3.a, NC.2.G.3.b, NC.2.G.3.c
- North Dakota 2.NO.NF.1, 2.NO.NF.2
- Ohio 2.G.3
- Oklahoma 2.N.3.1, 2.N.3.2
- Oregon 2.GM.A.3
- Pennsylvania CC.2.3.2.A.2
- Rhode Island 2.G.A.3
- South Carolina 2.NR.4.1
- South Dakota 2.G.A.3
- Tennessee 2.G.A.3, 3.G.A.2
- Texas 111.4.b.3.A, 111.4.b.3.D, 111.4.b.8.E, 111.5.b.6.E
- Utah 2.G.3
- Vermont 2.G.A.3
- Virginia 2.NS.3a, 2.NS.3e.i
- Washington 2.G.A.3
- West Virginia M.2.27
- Wisconsin M.2.G.A.3
- Wyoming 2.G.3a, 2.G.3b, 2.G.3c, 2.GP.3.A, 2.GP.3.B, 2.GP.3.C