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Instructional Video3:17
HOLIDAY RIDDLE - In The "12 Days Of Christmas," How Many Total Gifts Are Given? Instructional Video
Curated Video

HOLIDAY RIDDLE - In The "12 Days Of Christmas," How Many Total Gifts Are Given?

6th - 11th
You may remember the song "12 Days of Christmas" in which each day you get N gifts, plus all the gifts from the preceding days. How many gifts are given in total? What's a general formula? Algebraic
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Instructional Video2:05
The Rectangle Area Puzzle - The Trick To Solve Without Formulas Instructional Video
Curated Video

The Rectangle Area Puzzle - The Trick To Solve Without Formulas

6th - 11th
This is a video I made a long time ago but forgot to publish! Consider this puzzle as a bite-size holiday bonus. A rectangle is divided into 4 rectangles, and you know the areas of 3 of them are 16, 13, and 39. What is the area of the...
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