What this lesson shows
Fixes a mistake
Upside down, tall, or thin, 3 straight sides closed up make a triangle. A gap or a curve does not.
The worked example
The lesson works this one step by step: triangle (question 1). Then your kid tries one like it on paper.
The steps
- Count the straight sides
- Is it closed all around?
- Turned is still the same
- A gap or a curve is not
Helping at home
Read each box aloud. Your kid circles every one of that shape, even turned, big, small, or thin. Count the sides of each to check.
If your kid gets stuck
Turn the page in your head. Count the straight sides.
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 K.G.A.2
Correctly name shapes regardless of their orientations or overall size.
Matches standards in 49 statesSee each state's code
- Alabama MA19.K.19
- Alaska K.G.2
- Arizona K.G.A.2
- Arkansas K.GM.2
- California K.G.A.2
- Colorado K.G.A.2
- Connecticut K.G.A.2
- Delaware K.G.A.2
- District of Columbia K.G.A.2
- Florida MA.K.GR.1.1
- Hawaii K.G.A.2
- Idaho K.G.A.2
- Illinois K.G.A.2
- Iowa K.G.A.2
- Kansas K.G.2
- Kentucky KY.K.G.2
- Louisiana K.G.A.2
- Maine K.G.A.2
- Maryland K.GR.B.5
- Massachusetts K.G.A.2
- Michigan K.G.A.2
- Minnesota K.3.1.1, 2.3.1.2
- Mississippi K.G.2
- Missouri K.GM.C.6, 1.GM.A.3
- Montana MT.K.G.2
- Nebraska K.G.1.a, K.G.1.b
- Nevada K.G.A.2
- New Hampshire K.G.A.2
- New Jersey K.G.A.2
- New Mexico K.G.A.2
- New York NY-K.G.2
- North Carolina NC.K.G.2
- North Dakota K.GM.G.1, K.GM.G.2, 1.GM.G.2
- Ohio K.G.2
- Oklahoma K.GM.1.1, 1.GM.1.1, 1.GM.1.4
- Oregon K.GM.A.2
- Pennsylvania CC.2.3.K.A.1
- Rhode Island K.G.A.2
- South Carolina K.MGSR.2.1
- South Dakota K.G.A.2
- Tennessee K.G.A.2
- Texas 111.2.b.6.A, 111.2.b.6.B
- Utah K.G.2
- Vermont K.G.A.2
- Virginia K.MG.2a, K.MG.2d, 2.MG.4c
- Washington K.G.A.2
- West Virginia M.K.21
- Wisconsin M.K.G.A.2
- Wyoming K.G.2