What this lesson shows
Fixes a mistake
Two halves of a 3 by 4 grid can look different. Each has 6 squares, so both are halves.
The worked example
The lesson works this one step by step: 3 by 4 rectangle of squares (question 1). Then your kid tries one like it on paper.
The steps
- Cut along the squares
- Count the squares in each part
- The same count: halves
- Halves can look different
Helping at home
Draw a rectangle of squares and cut it along the squares into two parts that look different. Count the squares in each part. The same count means the same size: halves.
If your kid gets stuck
Count the squares in each part.
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