What this lesson shows
7 × n = 56, n ÷ 6 = 5, 3 = n ÷ 12, each turned into a known fact.
The worked example
The lesson works this one step by step: 3 = n ÷ 12. Then your kid tries one like it on paper.
The steps
- Read what it says
- Turn it into a fact you know
- Work it out
- Put it back to check
Helping at home
Read the equation aloud with "is the same as" for the equal sign. Then ask what number is missing, and turn it into a fact you know: a missing factor is found by dividing, a missing number that was divided by multiplying. Put the number back in place of n to check.
If your kid gets stuck
Say it with "is the same as" for the equal sign.
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 3.OA.A.4
Determine the unknown whole number in a multiplication or division equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 × ? = 48, 5 = _ ÷ 3, 6 × 6 = ?
Matches standards in 45 statesSee each state's code
- Alabama MA19.3.4
- Alaska 3.OA.4
- Arizona 3.OA.A.4
- Arkansas 3.CAR.8
- California 3.OA.A.4
- Colorado 3.OA.A.4
- Connecticut 3.OA.A.4
- Delaware 3.OA.A.4
- District of Columbia 3.OA.A.4
- Florida MA.3.AR.2.3
- Georgia 3.PAR.3.7
- Hawaii 3.OA.A.4
- Idaho 3.OA.A.4
- Illinois 3.OA.A.4
- Iowa 3.OA.A.4
- Kansas 3.OA.4
- Kentucky KY.3.OA.4
- Louisiana 3.OA.A.4
- Maine 3.OA.A.4
- Maryland 3.NOS.C.5
- Massachusetts 3.OA.A.4
- Michigan 3.OA.A.4
- Minnesota 3.2.2.1, 3.2.2.2
- Mississippi 3.OA.4
- Missouri 3.RA.A.5
- Montana MT.3.OA.4
- Nevada 3.OA.A.4
- New Hampshire 3.OA.A.4
- New Jersey 3.OA.A.4
- New Mexico 3.OA.A.4
- New York NY-3.OA.4
- North Carolina NC.3.OA.7.c
- Ohio 3.OA.4
- Oklahoma 3.A.2.1, 4.A.2.1
- Oregon 3.OA.A.4
- Pennsylvania CC.2.2.3.A.1
- Rhode Island 3.OA.A.4
- South Carolina 3.PAFR.2.1
- South Dakota 3.OA.A.4
- Tennessee 3.OA.A.4
- Texas 111.5.b.5.D
- Utah 3.OA.4
- Vermont 3.OA.A.4
- Washington 3.OA.A.4
- West Virginia M.3.4
More in this unit
- Equal groups and arrays
- Groups or how many in each?
- Two kinds of division
- Equal jumps on a number line
- Turn the array
- Facts from facts you know
- Add the parts
- One digit times two digits
- Multiply both parts
- Three factors, any order
- Times tens and hundreds
- Counting zeros fails
- One array, four facts
- True or false?
- The answer can go first
- Even or odd?
- The ones digit decides
- Is it a multiple?
- A number is its own multiple
- Patterns from a rule
- Position is not value
- Two-step word problems
- Finish the second step
- One pattern, two ways