What this lesson shows
A ruler zoomed in: halves, fourths, eighths.
The worked example
The lesson works this one step by step: 2 3/8. Then your kid tries one like it on paper.
The steps
- Middle mark: halves
- Shorter: fourths
- Shortest: eighths
- Count spaces from the inch
Helping at home
Between two inch marks, the longest mark is the half, the next are fourths, and the shortest are eighths: 8 equal spaces. Start the line at 0, find the whole inch, then count eighth spaces past it. A half is 4 eighths and a fourth is 2.
If your kid gets stuck
Find the whole inches first, then count eighths.
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 4.MD.B.4
Make a line plot to display a data set of measurements in fractions of a unit (1/2, 1/4, 1/8). Solve problems involving addition and subtraction of fractions by using information presented in line plots. For example, from a line plot find and interpret the difference in length between the longest and shortest specimens in an insect collection.
Matches standards in 50 statesSee each state's code
- Alabama MA19.4.20a, MA19.4.20b
- Alaska 4.MD.5
- Arizona 4.MD.B.4 *
- Arkansas 4.DA.1, 4.DA.2
- California 4.MD.B.4
- Colorado 4.MD.B.4
- Connecticut 4.MD.B.4
- Delaware 4.MD.B.4
- District of Columbia 4.MD.B.4
- Florida MA.4.M.1.1, MA.4.DP.1.1, MA.4.DP.1.3
- Georgia 4.MDR.6.2, 4.MDR.6.3
- Hawaii 4.MD.B.4
- Idaho 4.MD.B.4
- Illinois 4.MD.B.4
- Indiana 4.DA.1, 4.DA.2, 4.M.1
- Iowa 4.MD.B.4
- Kansas 4.MD.4
- Kentucky KY.4.MD.4.a, KY.4.MD.4.b, KY.4.MD.4.c
- Louisiana 4.MD.B.4
- Maine 4.MD.B.4
- Maryland 4.DS.A.1.a, 4.DS.A.1.b
- Massachusetts 4.MD.B.4
- Michigan 4.MD.B.4
- Minnesota 4.4.1.1
- Mississippi 4.MD.4
- Missouri 4.DS.A.1, 4.DS.A.2, 4.DS.A.3
- Montana MT.4.MD.4, 4.D1.12
- Nebraska 4.G.2.a, 4.D.1.a, 4.D.2.a
- Nevada 4.MD.B.4
- New Hampshire 4.MD.B.4
- New Jersey 4.DL.A.2, 4.DL.A.4, 4.DL.B.5
- New Mexico 4.MD.B.4
- New York NY-4.MD.4
- North Carolina NC.4.MD.1.a, NC.4.MD.4.a, NC.4.MD.4.b
- North Dakota 4.GM.M.3, 4.DPS.D.1, 4.DPS.D.2, 4.DPS.D.3
- Ohio 4.MD.4
- Oklahoma 4.GM.2.4, 4.GM.2.7, 4.D.1.1, 4.D.1.2, 4.D.1.3, 5.GM.3.2
- Oregon 4.DR.A.1, 4.DR.B.2
- Pennsylvania CC.2.4.4.A.2, CC.2.4.4.A.4
- Rhode Island 4.MD.B.4
- South Carolina 4.MGSR.2.4, 4.DPSR.1.2, 5.MGSR.2.2, 4.DPSR.1.1
- South Dakota 4.MD.B.4
- Tennessee 4.MD.A.1, 4.MD.B.4
- Texas 111.6.b.9.A, 111.6.b.9.B, 111.7.b.9.A, 111.7.b.9.C
- Utah 4.MD.4
- Vermont 4.MD.B.4
- Virginia 4.MG.1a.i, 4.MG.1a.ii, 4.MG.1b.ii, 4.MG.1b.iii, 4.MG.1c, 4.PS.1a, 4.PS.1b, 4.PS.1d.v, 5.MG.1a.i, 5.MG.1a.ii, 5.MG.1a.iii, 5.MG.1b.i, 5.MG.1b.ii, 5.MG.1b.iii, 5.PS.1d, 5.PS.1e.v, 4.MG.1b.i
- Washington 4.MD.B.4
- West Virginia M.4.22
- Wisconsin M.4.MD.B.4