Adding decimals to thousandths: 5th grade math lesson

What this lesson shows

8.72 + 3.032: estimate 9 + 3, write 8.720, then add place by place.

The worked example

The lesson works this one step by step: 8.72 + 3.032. Then your kid tries one like it on paper.

The steps

Estimate
Line up, fill with 0
Add, check the estimate

Helping at home

Estimate first. Line up the points, write a 0 in any empty place so both numbers reach the same place, then add from the right like whole numbers and bring the point straight down.

If your kid gets stuck

Estimate first, then line up the points.

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.

See how Lux works

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

Adding decimals to thousandths