How many at the start?: 1st grade math lesson

What this lesson shows

Some birds sat on a fence. 5 more came, and now there are 12: ? + 5 = 12.

The worked example

The lesson works this one step by step: some stars, get 5 more, now 12. Then your kid tries one like it on paper.

The steps

A box for the start
Draw them all
Take away the new ones

Helping at home

The end number is everything. Draw it all, mark the ones that were added, and take them away. What is left was there at the start.

If your kid gets stuck

Draw them all, then take away the new ones.

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.
Common Core 2.OA.A.1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using 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, MA19.2.1
Alaska 1.OA.1, 2.OA.1
Arizona 1.OA.A.1, 2.OA.A.1
Arkansas 1.CAR.1, 1.CAR.6, 2.CAR.7
California 1.OA.A.1, 2.OA.A.1
Colorado 1.OA.A.1, 2.OA.A.1
Connecticut 1.OA.A.1, 2.OA.A.1
Delaware 1.OA.A.1, 2.OA.A.1
District of Columbia 1.OA.A.1, 2.OA.A.1
Florida MA.1.NSO.2.1, MA.1.AR.1.2, MA.2.AR.1.1
Georgia 1.NR.2.1, 1.NR.2.4, 1.NR.5.1
Hawaii 1.OA.A.1, 2.OA.A.1
Idaho 1.OA.A.1, 1.OA.C.6, 2.OA.A.1
Illinois 1.OA.A.1, 2.OA.A.1
Indiana 1.CA.2, 2.CA.1
Iowa 1.OA.A.1, 1.OA.IA.C.2, 2.OA.A.1
Kansas 1.OA.1, 2.OA.1
Kentucky KY.1.OA.1, KY.2.OA.1
Louisiana 1.OA.A.1, 2.OA.A.1
Maine 1.OA.A.1, 2.OA.A.1
Maryland 1.AT.A.2, 2.AT.A.1, 2.AT.A.2
Massachusetts 1.OA.A.1, 2.OA.A.1
Michigan 1.OA.A.1, 2.OA.A.1
Minnesota 1.1.2.1, 1.2.2.1, 1.2.2.4, 2.1.2.5, 2.2.2.1, 2.2.2.2
Mississippi 1.OA.1, 2.OA.1
Missouri 1.RA.A.1, 1.RA.C.8, 2.NBT.C.11
Montana MT.1.OA.1, MT.1.OA.6, MT.2.OA.1
Nebraska 1.N.4.b, 1.N.5.f, 1.N.5.g, 2.N.5.a, 2.N.5.b
Nevada 1.OA.A.1, 2.OA.A.1
New Hampshire 1.OA.A.1, 2.OA.A.1
New Jersey 1.OA.A.1, 2.OA.A.1
New Mexico 1.OA.A.1, 2.OA.A.1
New York NY-1.OA.1, NY-2.OA.1.a, NY-2.OA.1.b
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, 2.AR.OA.3, 2.AR.OA.4
Ohio 1.OA.1, 2.OA.1
Oklahoma 1.N.2.1, 1.N.2.3, 2.N.2.5, 2.A.2.2
Oregon 1.OA.A.1, 2.OA.A.1
Pennsylvania CC.2.2.1.A.1, CC.2.2.2.A.1
Rhode Island 1.OA.A.1, 2.OA.A.1
South Carolina 1.PAFR.1.4, 1.PAFR.1.3, 2.PAFR.1.3
South Dakota 1.OA.A.1, 2.OA.A.1
Tennessee 1.OA.A.1, 1.OA.C.6, 2.OA.A.1
Texas 111.3.b.3.B, 111.3.b.3.E, 111.3.b.3.F, 111.3.b.5.D, 111.4.b.4.C, 111.4.b.4.D, 111.4.b.7.C
Utah 1.OA.1, 1.OA.6.b, 2.OA.1
Vermont 1.OA.A.1, 2.OA.A.1
Virginia 1.CE.1a, 1.CE.1b, 1.CE.1c, 1.CE.1f, 1.CE.1l, 2.CE.1c
Washington 1.OA.A.1, 2.OA.A.1
West Virginia M.1.1, M.2.1
Wisconsin M.1.OA.A.1, M.2.OA.A.1
Wyoming 1.OA.1, 2.OA.1

How many at the start?