What this lesson shows
Fixes a mistake
1 has one factor, so it is neither. 9 is odd and composite.
The worked example
The lesson works this one step by step: 9. Then your kid tries one like it on paper.
The steps
- 1 has one factor: neither
- Odd can be composite
- 2 is even and prime
- Count the factors
Helping at home
List every factor before deciding. Exactly two factors: prime. More than two: composite. 1 has only one factor, so it is neither. Odd or even never decides it.
If your kid gets stuck
List the factors first, then count 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.
Standards
- Common Core 4.OA.B.4
Find all factor pairs for a whole number in the range 1-100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1-100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1-100 is prime or composite.
Matches standards in 48 statesSee each state's code
- Alabama MA19.4.4a, MA19.4.4b
- Alaska 4.OA.4
- Arizona 4.OA.B.4, 5.OA.B.4
- Arkansas 4.CAR.1
- California 4.OA.B.4
- Colorado 4.OA.B.4
- Connecticut 4.OA.B.4
- Delaware 4.OA.B.4
- District of Columbia 4.OA.B.4
- Florida MA.4.AR.3.1
- Georgia 4.PAR.3.3, 4.PAR.3.4
- Hawaii 4.OA.B.4
- Idaho 4.OA.B.4.a, 4.OA.B.4.b, 4.OA.B.4.c
- Illinois 4.OA.B.4
- Indiana 4.CA.4
- Iowa 4.OA.B.4
- Kansas 4.OA.4
- Kentucky KY.4.OA.4.a, KY.4.OA.4.b, KY.4.OA.4.c, KY.4.OA.4.d
- Louisiana 4.OA.B.4.a, 4.OA.B.4.b, 4.OA.B.4.c, 4.OA.B.4.d
- Maine 4.OA.B.4
- Maryland 4.NOS.C.8.a, 4.NOS.C.8.b, 4.NOS.C.8.c, 4.NOS.C.8.d
- Massachusetts 4.OA.B.4
- Michigan 4.OA.B.4
- Mississippi 4.OA.4
- Missouri 4.RA.B.4, 4.RA.B.5
- Montana MT.4.OA.4, 4.D1.6, 4.D2.3
- Nebraska 4.N.4.a, 4.N.4.b
- Nevada 4.OA.B.4
- New Hampshire 4.OA.B.4
- New Jersey 4.OA.B.4
- New Mexico 4.OA.B.4
- New York NY-4.OA.4
- North Carolina NC.4.OA.4.a, NC.4.OA.4.b, NC.4.OA.4.c
- North Dakota 4.AR.OA.4, 5.AR.OA.4
- Ohio 4.OA.4
- Oregon 4.OA.B.4
- Pennsylvania CC.2.2.4.A.2
- Rhode Island 4.OA.B.4
- South Carolina 5.PAFR.3.2, 4.PAFR.3.1, 3.PAFR.2.4
- South Dakota 4.OA.B.4.a, 4.OA.B.4.b, 4.OA.B.4.c, 4.OA.B.4.d
- Tennessee 4.OA.B.4
- Texas 111.7.b.4.A
- Utah 4.OA.4
- Vermont 4.OA.B.4
- Virginia 4.CE.2e, 4.CE.2f, 5.NS.2a, 5.NS.2b
- Washington 4.OA.B.4
- West Virginia M.4.4
- Wisconsin M.4.OA.B.4