What this lesson shows
Fixes a mistake
6.32 + 2.8 is near 6 + 3, so 6.60 cannot be right. The 8 is tenths.
The worked example
The lesson works this one step by step: 6.32 + 2.8. Then your kid tries one like it on paper.
The steps
- The estimate says no
- Line up the points
- Check again
Helping at home
Estimate before adding, and check the answer against it. If they are far apart, look at the places: line up the points, not the right edges.
If your kid gets stuck
About how much should the answer be?
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 5.NBT.B.7
Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
Matches a standard in all 50 states and DCSee each state's code
- Alabama MA19.5.8a, MA19.5.8b
- Alaska 5.NBT.7
- Arizona 5.NBT.B.7 *
- Arkansas 5.CAR.3, 5.CAR.4
- California 5.NBT.B.7
- Colorado 5.NBT.B.7
- Connecticut 5.NBT.B.7
- Delaware 5.NBT.B.7
- District of Columbia 5.NBT.B.7
- Florida MA.5.NSO.2.3, MA.5.NSO.2.4, MA.5.M.2.1
- Georgia 5.NR.4.4
- Hawaii 5.NBT.B.7
- Idaho 5.NBT.A.7.a, 5.NBT.A.7.b
- Illinois 5.NBT.B.7
- Indiana 5.CA.9, 5.CA.10
- Iowa 5.NBT.B.7
- Kansas 5.NBT.7
- Kentucky KY.5.NBT.7.a, KY.5.NBT.7.b
- Louisiana 5.NBT.B.7
- Maine 5.NBT.B.7
- Maryland 5.NOS.B.4.a, 5.NOS.B.5.a, 5.NOS.B.6.b, 5.NOS.B.6.c, 5.NOS.B.6.d, 5.NOS.B.7.a, 5.NOS.B.7.b, 5.NOS.B.7.c, 5.NOS.B.7.d, 5.NOS.B.7.e
- Massachusetts 5.NBT.B.7
- Michigan 5.NBT.B.7
- Minnesota 5.1.1.3, 5.1.3.1, 5.1.3.2, 5.1.3.4
- Mississippi 5.NBT.7
- Missouri 5.NBT.A.6, 5.NBT.A.7, 5.NBT.A.8, 5.NF.B.4, 5.RA.C.5
- Montana MT.5.NBT.7, 5.D1.11, 5.D1.12, 5.D1.13, 5.D2.11, 5.D2.12
- Nebraska 5.N.3.g, 5.A.1.c
- Nevada 5.NBT.B.7
- New Hampshire 5.NBT.B.7
- New Jersey 5.NBT.B.7
- New Mexico 5.NBT.B.7
- New York NY-5.NBT.7
- North Carolina NC.5.NBT.7.a, NC.5.NBT.7.b, NC.5.NBT.7.c, NC.5.NBT.7.d
- North Dakota 5.NO.NBT.5
- Ohio 5.NBT.7.a, 5.NBT.7.b, 5.NBT.7.c
- Oklahoma 5.N.2.1, 5.N.3.2, 5.N.3.3
- Oregon 5.NBT.B.7
- Pennsylvania CC.2.1.5.B.2
- Rhode Island 5.NBT.B.7
- South Carolina 5.PAFR.1.4, 5.PAFR.1.3
- South Dakota 5.NBT.B.7.a, 5.NBT.B.7.b
- Tennessee 5.NBT.B.7
- Texas 111.6.b.4.A, 111.7.b.3.A, 111.7.b.3.D, 111.7.b.3.E, 111.7.b.3.F, 111.7.b.3.G, 111.7.b.3.K
- Utah 5.NBT.7
- Vermont 5.NBT.B.7
- Virginia 4.CE.4a.i, 4.CE.4a.ii, 4.CE.4b, 5.CE.3a, 5.CE.3b.i, 5.CE.3b.ii, 5.CE.3b.iii, 5.CE.3c.i, 5.CE.3c.ii, 5.CE.3c.iii, 5.CE.3c.iv, 5.CE.3d, 5.CE.3e
- Washington 5.NBT.B.7
- West Virginia M.5.10
- Wisconsin M.5.NBT.A.4, M.5.NBT.B.7
- Wyoming 5.NBT.7