What this lesson shows
Fixes a mistake
9:55 to 10:05 is 10 minutes, not 50. An hour has 60 minutes.
The worked example
The lesson works this one step by step: 9:55 a.m. to 10:05 a.m. Then your kid tries one like it on paper.
The steps
- Not like whole numbers
- An hour is 60 minutes
- Count up across the hour
Helping at home
Never subtract the times as plain numbers. Count up on a number line: to the next whole hour first, then the minutes past it. An hour has 60 minutes.
If your kid gets stuck
Count up to the hour first.
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 3.MD.A.1
Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram.
Matches standards in 50 statesSee each state's code
- Alabama MA19.3.18a
- Alaska 3.MD.1
- Arizona 3.MD.A.1a
- Arkansas 2.GM.11, 3.GM.10, 3.GM.11
- California 3.MD.A.1
- Colorado 3.MD.A.1
- Connecticut 3.MD.A.1
- Delaware 3.MD.A.1
- District of Columbia 3.MD.A.1
- Florida MA.3.M.2.1, MA.3.M.2.2
- Georgia 3.MDR.5.2, 3.MDR.5.3
- Hawaii 3.MD.A.1
- Idaho 3.MD.A.1
- Illinois 3.MD.A.1
- Indiana 3.M.3, 2.M.4
- Iowa 3.MD.A.1
- Kansas 3.MD.1
- Kentucky KY.3.MD.1
- Louisiana 3.MD.A.1.a, 3.MD.A.1.b, 3.MD.A.1.c
- Maine 3.MD.A.1
- Maryland 2.GR.C.7, 2.GR.C.8, 3.GR.A.2
- Massachusetts 3.MD.A.1
- Michigan 3.MD.A.1
- Minnesota 3.3.3.1
- Mississippi 3.MD.1
- Missouri 3.GM.B.4, 3.GM.B.5, 3.GM.B.6
- Montana MT.3.MD.1, 4.D1.18
- Nebraska 3.G.4.a, 3.G.4.b
- Nevada 3.MD.A.1
- New Hampshire 3.MD.A.1
- New Jersey 3.M.A.1
- New Mexico 3.MD.A.1
- New York NY-3.MD.1
- North Carolina NC.3.MD.1
- North Dakota 3.GM.M.3, 3.GM.M.4
- Ohio 3.MD.1.a
- Oklahoma 3.GM.3.2
- Oregon 3.GM.B.3
- Pennsylvania CC.2.4.3.A.2
- Rhode Island 3.MD.A.1
- South Carolina 3.MGSR.2.2, 4.MGSR.2.2, 3.MGSR.2.3
- South Dakota 3.MD.A.1
- Tennessee 3.MD.A.1.a
- Texas 111.4.b.9.G, 111.5.b.7.C
- Utah 3.MD.1
- Vermont 3.MD.A.1
- Virginia 3.MG.3a, 3.MG.3b, 3.MG.3c.i, 3.MG.3c.ii, 3.MG.3c.iii, 4.MG.2a.i, 4.MG.2a.ii, 4.MG.2a.iii
- Washington 3.MD.A.1
- West Virginia M.3.18
- Wisconsin M.3.MD.A.1