Triangles: Describing, Counting, and Estimating contains over 100 fully-automated slides to help your students with geometry and estimation.
DESCRIBING: 8 slides explain about corners and edges, the “tri” in triangle, and the types of triangles: equilateral, isosceles, scalene or a right triangle.
COUNTING: 13 increasingly challenging problems give students a chance to count the triangles in overlapping configurations, followed by a timed test of 10 more problems. Students begin with easy problems, learning to identify the variety of triangles within overlapping triangles: little triangles, medium triangles, and big triangles. Even though I have drawn only three triangles per slide, the answers range from 4 to 23. Yes, twenty-three triangles, and each of the 13 Challenges is followed by the answer in slow-motion animation, allowing your students to see each and every triangle as they pinwheel into place or fly in from the edges. Unlike other versions of this popular game that you will find on the internet, mine is made for students, showing them the answer (instead of just leaving them wondering how there could possibly be 23 triangles in Challenge #13).
ESTIMATING: 10 timed challenges give your students a chance to apply what they’ve learned by comparing two problems side-by-side, quickly, estimating which has more triangles.
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If you would like Estimating activities, take a look at these packets:
Estimating with Polygons
Estimating with Numbers
Estimating with Coins
Estimating Area and Perimeter
Here are several PowerPoint slideshows on Estimating:
Estimating with Multiplication Arrays PowerPoint