What this lesson shows
Measure one book twice: about 30 centimeters, then about 12 inches. An inch is bigger, so fewer fit.
The worked example
The lesson works this one step by step: 12 in and 30 cm. Then your kid tries one like it on paper.
The steps
- Measure in inches
- Measure in centimeters
- Bigger unit, fewer units
Helping at home
Measure one thing with an inch ruler, then a centimeter ruler. An inch is bigger, so fewer inches fit: the inch number is smaller.
If your kid gets stuck
Which unit is bigger?
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.MD.A.2
Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen.
Matches standards in 50 statesSee each state's code
- Alabama MA19.2.17, MA19.2.18, MA19.2.19
- Alaska 2.MD.2, 2.MD.3
- Arizona 2.MD.A.2
- Arkansas 2.GM.3, 2.GM.4
- California 2.MD.A.2
- Colorado 2.MD.A.2
- Connecticut 2.MD.A.2
- Delaware 2.MD.A.2
- District of Columbia 2.MD.A.2
- Florida MA.2.M.1.1
- Georgia 2.MDR.5.1, 2.MDR.5.2
- Hawaii 2.MD.A.2
- Idaho 2.MD.A.2
- Illinois 2.MD.A.2
- Indiana 2.M.2
- Iowa 2.MD.A.2
- Kansas 2.MD.2
- Kentucky KY.2.MD.2
- Louisiana 2.MD.A.2
- Maine 2.MD.A.2
- Maryland 2.GR.A.1, 2.GR.A.2
- Massachusetts 2.MD.A.2
- Michigan 2.MD.A.2
- Minnesota 2.3.2.1, 2.3.2.2
- Mississippi 2.MD.2
- Missouri 2.GM.B.4, 2.GM.B.5
- Montana MT.2.MD.2, MT.2.MD.3
- Nebraska 2.G.2.a, 2.G.3.a, 2.G.3.b
- Nevada 2.MD.A.2
- New Hampshire 2.MD.A.2
- New Jersey 2.M.A.2
- New Mexico 2.MD.A.2
- New York NY-2.MD.2
- North Carolina NC.2.MD.2, NC.2.MD.3, NC.3.MD.2.a
- North Dakota 2.GM.M.1
- Ohio 2.MD.2
- Oklahoma 1.GM.2.3, 2.GM.2.1, 2.GM.2.2, 3.GM.2.5, 3.GM.2.6, 5.GM.3.5
- Oregon 2.GM.B.4, 2.GM.B.5
- Pennsylvania CC.2.4.2.A.1
- Rhode Island 2.MD.A.2
- South Carolina 2.MGSR.1.1, 3.MGSR.2.4
- South Dakota 2.MD.A.2
- Tennessee 2.MD.A.2, 2.MD.A.3
- Texas 111.3.b.7.C, 111.4.b.9.A, 111.4.b.9.B, 111.4.b.9.D
- Utah 2.MD.2
- Vermont 2.MD.A.2
- Virginia 1.MG.1b, 2.MG.1a.i, 2.MG.1b.i, 3.MG.1b.i
- Washington 2.MD.A.2
- West Virginia M.2.16
- Wisconsin M.2.MD.A.2