What this lesson shows
3.9 and one tenth more is 4, not 3.91.
The worked example
The lesson works this one step by step: 3.9 + 0.1. Then your kid tries one like it on paper.
The steps
- Find the place
- Change that digit by 1
- 10 tenths make 1 whole
- Add a 0 to take a hundredth
Helping at home
Find the place the question names, tenths or hundredths, and change only that digit by 1. Ten in a place trades for 1 in the place to its left; a 0 to take from borrows from the left. Write a 0 on the end first when it helps.
If your kid gets stuck
Which place changes?
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.NF.C.6
Use decimal notation for fractions with denominators 10 or 100. For example, rewrite 0.62 as 62/100; describe a length as 0.62 meters; locate 0.62 on a number line diagram.
Matches standards in 50 statesSee each state's code
- Alabama MA19.4.18
- Alaska 4.NF.6
- Arizona 4.NF.C.6 *
- Arkansas 4.NPV.10
- California 4.NF.C.6
- Colorado 4.NF.C.6
- Connecticut 4.NF.C.6
- Delaware 4.NF.C.6
- District of Columbia 4.NF.C.6
- Florida MA.4.NSO.2.6, MA.4.FR.1.2
- Georgia 4.NR.5.2
- Hawaii 4.NF.C.6
- Idaho 4.NF.C.6
- Illinois 4.NF.C.6
- Indiana 4.NS.5
- Iowa 4.NF.C.6
- Kansas 4.NF.6
- Kentucky KY.4.NF.6
- Louisiana 4.NF.C.6
- Maine 4.NF.C.6
- Maryland 4.NOS.F.15
- Massachusetts 4.NF.C.6
- Michigan 4.NF.C.6
- Minnesota 4.1.2.6, 5.1.2.2, 5.1.2.4
- Mississippi 4.NF.6
- Missouri 4.NF.C.9, 4.NF.C.10, 4.NF.C.11, 5.NF.A.1, 5.NF.A.2
- Montana MT.4.NF.6, 4.D2.5
- Nebraska 4.N.1.a, 4.N.1.d, 5.N.2.a
- Nevada 4.NF.C.6
- New Hampshire 4.NF.C.6
- New Jersey 4.NF.C.6
- New Mexico 4.NF.C.6
- New York NY-4.NF.6
- North Carolina NC.4.NF.6.a, NC.4.NF.6.c
- North Dakota 4.NO.NF.1, 5.NO.NF.1
- Ohio 4.NF.6
- Oklahoma 4.N.3.6, 4.N.3.7, 4.N.3.9, 5.N.1.1, 5.N.1.4, 5.N.3.4
- Oregon 4.NF.C.6
- Pennsylvania CC.2.1.4.C.3
- Rhode Island 4.NF.C.6
- South Carolina 4.NR.2.1
- South Dakota 4.NF.C.6
- Tennessee 4.NF.C.6
- Texas 111.6.b.2.B, 111.6.b.2.E, 111.6.b.2.G, 111.6.b.2.H, 111.6.b.3.G
- Utah 4.NF.6
- Vermont 4.NF.C.6
- Virginia 4.NS.5a, 4.NS.5b, 5.NS.1a, 5.NS.1b, 5.NS.1c, 4.NS.5c
- Washington 4.NF.C.6
- West Virginia M.4.17
- Wisconsin M.4.NF.C.6