Facts that go together: 1st grade math lesson

What this lesson shows

4, 3, and 7 make four facts: 4 + 3, 3 + 4, 7 − 3, and 7 − 4.

The worked example

The lesson works this one step by step: 4, 3, 7. Then your kid tries one like it on paper.

The steps

Two parts make the whole
Add them both ways
Take each part away

Helping at home

The two small numbers are the parts and the big one is the whole. Add the parts both ways. Take each part away from the whole. Cubes in two colors help.

If your kid gets stuck

Which number is the 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 1.OA.B.3
Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)
Common Core 1.OA.C.6
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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

Alabama MA19.1.3, MA19.1.6a, MA19.1.6b, MA19.1.6c, MA19.1.6d, MA19.1.6e
Alaska 1.OA.3, 1.OA.6
Arizona 1.OA.B.3
Arkansas 1.CAR.3, 1.CAR.1, 1.CAR.2
California 1.OA.B.3, 1.OA.C.6
Colorado 1.OA.B.3, 1.OA.C.6
Connecticut 1.OA.B.3, 1.OA.C.6
Delaware 1.OA.B.3, 1.OA.C.6
District of Columbia 1.OA.B.3, 1.OA.C.6
Florida MA.1.AR.1.1, MA.1.NSO.2.1, MA.1.NSO.2.2
Georgia 1.NR.2.7, 1.NR.2.1, 1.NR.2.2, 1.NR.2.4
Hawaii 1.OA.B.3, 1.OA.C.6
Idaho 1.OA.A.2, 1.OA.B.3, 1.OA.C.6
Illinois 1.OA.B.3, 1.OA.C.6
Indiana 2.CA.3, 1.CA.1
Iowa 1.OA.B.3, 1.OA.C.6, 1.OA.IA.C.2, 1.OA.IA.C.1.b
Kansas 1.OA.3, 1.OA.6
Kentucky KY.1.OA.3, KY.1.OA.6.b
Louisiana 1.OA.B.3, 1.OA.C.6
Maine 1.OA.B.3, 1.OA.C.6
Maryland 1.NOS.C.7, 1.NOS.E.10.c, 1.NOS.E.10.a, 1.NOS.E.10.b, 1.NOS.E.12.a, 1.NOS.E.12.b, 1.NOS.E.13.a, 1.NOS.E.13.b, 2.NOS.B.6.a, 2.NOS.B.6.b
Massachusetts 1.OA.B.3, 1.OA.C.6
Michigan 1.OA.B.3, 1.OA.C.6
Minnesota 1.1.2.2, 2.1.2.1
Mississippi 1.OA.3, 1.OA.6
Missouri 1.RA.B.5, 1.RA.C.7, 1.RA.C.8
Montana MT.K.OA.6, MT.1.OA.2, MT.1.OA.3, MT.1.OA.6, MT.1.OA.7
Nebraska 1.N.5.d, 1.N.5.e, 1.N.4.a, 1.N.4.b
Nevada 1.OA.B.3, 1.OA.C.6
New Hampshire 1.OA.B.3, 1.OA.C.6
New Jersey 1.OA.B.3, 1.OA.C.6
New Mexico 1.OA.B.3, 1.OA.C.6
New York NY-1.OA.2, NY-1.OA.3, NY-1.OA.6.a
North Carolina NC.1.OA.3, NC.1.OA.9, NC.1.OA.6.a, NC.1.OA.6.b, NC.1.OA.6.c, NC.1.OA.6.d, NC.1.OA.6.e, NC.1.OA.6.f
North Dakota 1.AR.OA.1, 1.AR.OA.2, 1.AR.OA.3
Ohio 1.OA.2, 1.OA.3, 1.OA.6
Oklahoma 2.A.2.3, 3.A.2.2, 1.N.2.3
Oregon 1.OA.A.2, 1.OA.B.3, 1.OA.C.6
Pennsylvania CC.2.2.1.A.2
Rhode Island 1.OA.B.3, 1.OA.C.6
South Carolina 2.PAFR.1.6, 1.PAFR.1.5, 1.PAFR.1.4, 1.PAFR.1.2
South Dakota 1.OA.B.3, 1.OA.C.6
Tennessee 1.OA.A.2, 1.OA.B.3, 1.OA.C.5, 1.OA.C.6
Texas 111.3.b.3.C, 111.3.b.5.G, 111.3.b.3.D, 111.3.b.3.E
Utah 1.OA.3, 1.OA.6.a, 1.OA.6.b
Vermont 1.OA.B.3, 1.OA.C.6
Virginia 2.CE.1f, 1.CE.1a, 1.CE.1b, 1.CE.1c, 1.CE.1d, 1.CE.1e
Washington 1.OA.B.3, 1.OA.C.6
West Virginia M.1.3, M.1.6
Wisconsin M.1.OA.B.3, M.1.OA.C.6
Wyoming 1.OA.6

Facts that go together