What this lesson shows
A story adds three groups. Find two that make 10, add them first, then add the third.
The worked example
The lesson works this one step by step: 8 + 7 + 2. Then your kid tries one like it on paper.
The steps
- Write the story as one sum
- Find two that make 10
- 10 plus the rest
Helping at home
Read the story aloud and write its three numbers as one sum. Look for two numbers that make 10, add them first, then add the last number to 10.
If your kid gets stuck
Which two make 10?
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.A.2
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
Matches standards in 47 statesSee each state's code
- Alabama MA19.1.2, MA19.1.3
- Alaska 1.OA.2, 1.OA.3
- Arizona 1.OA.A.2, 1.OA.B.3
- Arkansas 1.CAR.3, 1.CAR.7
- California 1.OA.A.2
- Colorado 1.OA.A.2
- Connecticut 1.OA.A.2
- Delaware 1.OA.A.2
- District of Columbia 1.OA.A.2
- Florida MA.1.AR.1.1
- Georgia 1.NR.2.7
- Hawaii 1.OA.A.2
- Idaho 1.OA.A.2, 1.OA.B.3
- Illinois 1.OA.A.2
- Indiana 2.CA.3
- Iowa 1.OA.A.2, 1.OA.B.3
- Kansas 1.OA.2, 1.OA.3
- Kentucky KY.1.OA.3, KY.1.OA.2
- Louisiana 1.OA.A.2
- Maine 1.OA.A.2
- Maryland 1.NOS.C.7
- Massachusetts 1.OA.A.2
- Michigan 1.OA.A.2
- Mississippi 1.OA.2
- Missouri 1.RA.A.2
- Montana MT.K.OA.6, MT.1.OA.2
- Nebraska 1.N.5.d, 1.N.5.e
- Nevada 1.OA.A.2
- New Hampshire 1.OA.A.2
- New Jersey 1.OA.A.2, 1.OA.B.3
- New Mexico 1.OA.A.2
- New York NY-1.OA.2, NY-1.OA.3
- North Carolina NC.1.OA.3, NC.1.OA.2
- North Dakota 1.AR.OA.4
- Ohio 1.OA.2, 1.OA.3
- Oregon 1.OA.A.2, 1.OA.B.3
- Pennsylvania CC.2.2.1.A.1
- Rhode Island 1.OA.A.2
- South Carolina 2.PAFR.1.6, 1.PAFR.1.5
- South Dakota 1.OA.A.2, 1.OA.B.3
- Tennessee 1.OA.A.2, 1.OA.B.3
- Texas 111.3.b.3.C, 111.3.b.5.G
- Utah 1.OA.2, 1.OA.3
- Vermont 1.OA.A.2
- Washington 1.OA.A.2
- West Virginia M.1.2, M.1.3
- Wisconsin M.1.OA.A.2, M.1.OA.B.3