Adding mixed numbers: 4th grade math lesson

What this lesson shows

2 5/6 + 1 4/6: add wholes, add sixths, then 9/6 becomes 1 3/6.

The worked example

The lesson works this one step by step: 2 5/6 + 1 4/6. Then your kid tries one like it on paper.

The steps

Add the wholes
Add the parts
Parts over 1? Make a whole
Put it together

Helping at home

Add the wholes, then the parts. If the parts make a whole or more, trade a whole’s worth of parts for 1 whole. No simplifying: 4 3/6 is a right answer.

If your kid gets stuck

Wholes first, then parts. Do the parts make a whole?

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 4.NF.B.3c
Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.

Matches a standard in all 50 states and DCSee each state's code

Alabama MA19.4.15b
Alaska 4.NF.3.c
Arizona 4.NF.B.3.c, 4.NF.A.2.b
Arkansas 4.NPV.5, 4.CAR.5
California 4.NF.B.3
Colorado 4.NF.B.3.c
Connecticut 4.NF.B.3
Delaware 4.NF.B.3
District of Columbia 4.NF.B.3
Florida MA.4.FR.2.2
Georgia 4.NR.4.3, 4.NR.4.4, 4.NR.4.6, 5.NR.3.2
Hawaii 4.NF.B.3
Idaho 4.NF.A.2.b, 4.NF.B.3.c
Illinois 4.NF.B.3
Indiana 5.NS.1, 4.CA.7, 4.CA.6
Iowa 4.NF.A.2, 4.NF.B.3.c
Kansas 4.NF.3.c
Kentucky KY.4.NF.3.b, KY.4.NF.3.c, KY.4.NF.2
Louisiana 4.NF.B.3.b, 4.NF.B.3.c
Maine 4.NF.B.3c
Maryland 4.NOS.D.10.a, 4.NOS.E.12.c
Massachusetts 4.NF.B.3.c
Michigan 4.NF.B.3
Minnesota 4.1.2.2, 4.1.2.3, 5.1.2.3
Mississippi 4.NF.3.c
Missouri 4.NF.A.3, 4.NF.B.6, 5.NF.A.3
Montana MT.4.NF.3.a, MT.4.NF.3.c, 4.D1.2, 4.D1.25, 4.D2.6, 4.D4.1, 4.D5
Nebraska 4.N.2.a, 4.N.2.c, 4.N.3.b, 4.N.3.c, 5.N.2.b
Nevada 4.NF.B.3
New Hampshire 4.NF.B.3
New Jersey 4.NF.B.3c
New Mexico 4.NF.B.3
New York NY-4.NF.2, NY-4.NF.3.c
North Carolina NC.4.NF.3.c, NC.4.NF.3.d
North Dakota 4.NO.NF.2, 4.NO.NF.5
Ohio 4.NF.3.c
Oklahoma 4.N.3.2, 4.N.3.3, 4.N.3.5, 5.N.1.3
Oregon 4.NF.A.2, 4.NF.B.3
Pennsylvania CC.2.1.4.C.2
Rhode Island 4.NF.B.3.a, 4.NF.B.3.c
South Carolina 4.NR.2.4, 4.NR.2.6, 5.NR.2.1, 4.PAFR.2.1, 3.NR.2.4, 4.NR.2.5
South Dakota 4.NF.B.3.c
Tennessee 4.NF.A.2, 4.NF.B.3.c
Texas 111.6.b.3.A, 111.6.b.3.D, 111.6.b.3.E, 111.6.b.3.F, 111.6.b.3.G
Utah 4.NF.3.c
Vermont 4.NF.B.3
Virginia 3.NS.3b, 3.NS.3c, 3.NS.3e, 4.NS.3a, 4.NS.3b, 4.NS.3c, 4.NS.3d, 4.CE.3a
Washington 4.NF.B.3
West Virginia M.4.14
Wisconsin M.4.NF.A.2, M.4.NF.B.3
Wyoming 4.NF.2a, 4.NF.2b, 4.NFP.2.A, 4.NFP.2.B, 4.NF.3c, 4.NFP.3.C

Adding mixed numbers