Facts from facts you know: 3rd grade math lesson

What this lesson shows

6 × 9 as 4 × 9 + 2 × 9, one array split in two.

The worked example

The lesson works this one step by step: 6 × 9. Then your kid tries one like it on paper.

The steps

Draw the rows
Split off 5 rows
Work out each part
Add the parts

Helping at home

Draw the groups as rows of dots, then cut off 5 rows: fives are easy. Write each part in parentheses, work out each one, and add the two answers. Add the parts; never multiply them.

If your kid gets stuck

Split off 5 groups first.

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 3.OA.B.5
Apply properties of operations as strategies to multiply and divide. Examples: If 6 × 4 = 24 is known, then 4 × 6 = 24 is also known. (Commutative property of multiplication.) 3 × 5 × 2 can be found by 3 × 5 = 15, then 15 × 2 = 30, or by 5 × 2 = 10, then 3 × 10 = 30. (Associative property of multiplication.) Knowing that 8 × 5 = 40 and 8 × 2 = 16, one can find 8 × 7 as 8 × (5 + 2) = (8 × 5) + (8 × 2) = 40 + 16 = 56. (Distributive property.)

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

Alabama MA19.3.5, MA19.3.7a
Alaska 3.OA.5, 3.MD.9.c
Arizona 3.OA.B.5, 3.OA.C.7 *
Arkansas 3.CAR.2, 3.CAR.3
California 3.OA.B.5
Colorado 3.OA.B.5
Connecticut 3.OA.B.5
Delaware 3.OA.B.5
District of Columbia 3.OA.B.5
Florida MA.3.NSO.2.4, MA.3.AR.1.1
Georgia 3.PAR.3.3
Hawaii 3.OA.B.5
Idaho 3.OA.B.5, 3.OA.C.7.b
Illinois 3.OA.B.5
Indiana 4.CA.3, 3.CA.5, 3.CA.6, 3.CA.3
Iowa 3.OA.B.5, 3.OA.C.7
Kansas 3.OA.5, 3.OA.7
Kentucky KY.3.OA.5, KY.3.OA.7
Louisiana 3.OA.B.5
Maine 3.OA.B.5
Maryland 3.NOS.C.4, 3.NOS.E.9.a, 3.NOS.E.9.b, 3.NOS.E.9.c, 4.NOS.C.7.a, 4.NOS.C.7.c
Massachusetts 3.OA.B.5
Michigan 3.OA.B.5
Minnesota 3.1.2.5, 5.2.2.1
Mississippi 3.OA.5, 3.OA.7
Missouri 3.RA.B.6, 3.RA.C.7
Montana MT.3.OA.5, MT.3.MD.7.c
Nebraska 3.A.1.e, 3.A.1.g
Nevada 3.OA.B.5
New Hampshire 3.OA.B.5
New Jersey 3.OA.B.5
New Mexico 3.OA.B.5
New York NY-3.OA.5, NY-3.OA.7.a
North Carolina NC.3.OA.1.b
North Dakota 3.AR.OA.1, 3.AR.OA.2, 4.AR.OA.2, 5.AR.OA.1
Ohio 3.OA.5, 3.MD.7.c
Oklahoma 3.N.2.2, 3.N.2.8, 3.A.2.2, 5.A.2.1
Oregon 3.OA.B.5, 3.OA.C.7
Pennsylvania CC.2.2.3.A.2
Rhode Island 3.OA.B.5, 4.OA.A.3.a
South Carolina 3.PAFR.1.3
South Dakota 3.OA.B.5, 3.OA.C.7.a, 3.OA.C.7.b
Tennessee 3.OA.B.5, 3.OA.C.7, 3.MD.C.7.c
Texas 111.5.b.4.F, 111.5.b.4.G
Utah 3.OA.5, 3.OA.7.b
Vermont 3.OA.B.5
Virginia 3.CE.2c, 3.CE.2d, 3.CE.2f
Washington 3.OA.B.5
West Virginia M.3.5, M.3.7
Wisconsin M.3.OA.C.6, M.3.OA.B.4
Wyoming 3.OA.7, 3.MD.7c, 3.MDP.7.C

Facts from facts you know