What this lesson shows
Fixes a mistake
5 + 6 = □ + 4 is not 11. The right side must make 11 too: 7.
The worked example
The lesson works this one step by step: 5 + 6 = □ + 4. Then your kid tries one like it on paper.
The steps
- Work out the left side
- The right side must match
- What plus makes it?
Helping at home
Work out the left side first. Then ask what plus the number beside the box makes it. Check that both sides come out the same.
If your kid gets stuck
What does the left side make?
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 1.OA.D.8
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.
Matches standards in 46 statesSee each state's code
- Alabama MA19.1.8
- Alaska 1.OA.8
- Arizona 1.OA.D.8
- Arkansas 1.CAR.9
- California 1.OA.D.8
- Colorado 1.OA.D.8
- Connecticut 1.OA.D.8
- Delaware 1.OA.D.8
- District of Columbia 1.OA.D.8
- Florida MA.1.AR.2.3, MA.2.AR.2.2
- Georgia 1.NR.2.6
- Hawaii 1.OA.D.8
- Idaho 1.OA.D.8
- Illinois 1.OA.D.8
- Iowa 1.OA.D.8
- Kansas 1.OA.8
- Kentucky KY.1.OA.8
- Louisiana 1.OA.D.8
- Maine 1.OA.D.8
- Maryland 1.AT.A.3
- Massachusetts 1.OA.D.8
- Michigan 1.OA.D.8
- Minnesota 1.2.2.3, 2.2.2.1, 2.2.2.2
- Mississippi 1.OA.8
- Missouri 1.RA.A.4
- Montana MT.1.OA.9
- Nebraska 1.N.5.c
- Nevada 1.OA.D.8
- New Hampshire 1.OA.D.8
- New Jersey 1.OA.D.8
- New Mexico 1.OA.D.8
- New York NY-1.OA.8
- North Carolina NC.1.OA.8
- Ohio 1.OA.8
- Oklahoma 3.A.2.1, 2.A.2.3, 4.A.2.3
- Oregon 1.OA.D.8
- Rhode Island 1.OA.D.8
- South Carolina 2.PAFR.1.7, 1.PAFR.1.6
- South Dakota 1.OA.D.8
- Tennessee 1.OA.D.8
- Texas 111.3.b.3.B, 111.3.b.5.F, 111.4.b.7.C
- Utah 1.OA.8
- Vermont 1.OA.D.8
- Virginia 1.CE.1g, 2.CE.1g
- Washington 1.OA.D.8
- West Virginia M.1.8