How many more?: 1st grade math lesson

What this lesson shows

9 shells and 14 shells in two rows. The extra shells are the difference: 5.

The worked example

The lesson works this one step by step: 9 stars and 14 stars. Then your kid tries one like it on paper.

The steps

Two rows
Match one for one
Count the extra ones

Helping at home

Draw both groups in rows, one under the other, and match them one for one. The ones with no match are how many more.

If your kid gets stuck

Line them up and match them.

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 1.OA.A.1
Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

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

Alabama MA19.1.1a, MA19.1.1b, MA19.1.1c, MA19.1.1d, MA19.1.6a, MA19.1.6b, MA19.1.6c, MA19.1.6e
Alaska 1.OA.1
Arizona 1.OA.A.1
Arkansas 1.CAR.1, 1.CAR.6
California 1.OA.A.1
Colorado 1.OA.A.1
Connecticut 1.OA.A.1
Delaware 1.OA.A.1
District of Columbia 1.OA.A.1
Florida MA.1.NSO.2.1, MA.1.AR.1.2
Georgia 1.NR.2.1, 1.NR.2.4, 1.NR.5.1
Hawaii 1.OA.A.1
Idaho 1.OA.A.1, 1.OA.C.6
Illinois 1.OA.A.1
Indiana 1.CA.2
Iowa 1.OA.A.1, 1.OA.IA.C.2
Kansas 1.OA.1
Kentucky KY.1.OA.1
Louisiana 1.OA.A.1
Maine 1.OA.A.1
Maryland 1.AT.A.2
Massachusetts 1.OA.A.1
Michigan 1.OA.A.1
Minnesota 1.1.2.1, 1.2.2.1, 1.2.2.4
Mississippi 1.OA.1
Missouri 1.RA.A.1, 1.RA.C.8
Montana MT.1.OA.1, MT.1.OA.6
Nebraska 1.N.4.b, 1.N.5.f, 1.N.5.g
Nevada 1.OA.A.1
New Hampshire 1.OA.A.1
New Jersey 1.OA.A.1
New Mexico 1.OA.A.1
New York NY-1.OA.1
North Carolina NC.1.OA.9, NC.1.OA.1.a, NC.1.OA.1.b, NC.1.OA.1.c, NC.2.OA.1.a.1, NC.2.OA.1.b.1, NC.2.OA.1.b.2
North Dakota 1.AR.OA.1, 1.AR.OA.4, 1.AR.OA.5
Ohio 1.OA.1
Oklahoma 1.N.2.1, 1.N.2.3
Oregon 1.OA.A.1
Pennsylvania CC.2.2.1.A.1
Rhode Island 1.OA.A.1
South Carolina 1.PAFR.1.4, 1.PAFR.1.3
South Dakota 1.OA.A.1
Tennessee 1.OA.A.1, 1.OA.C.6
Texas 111.3.b.3.B, 111.3.b.3.E, 111.3.b.3.F, 111.3.b.5.D
Utah 1.OA.1, 1.OA.6.b
Vermont 1.OA.A.1
Virginia 1.CE.1a, 1.CE.1b, 1.CE.1c, 1.CE.1f, 1.CE.1l
Washington 1.OA.A.1
West Virginia M.1.1
Wisconsin M.1.OA.A.1
Wyoming 1.OA.1

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