About This Lesson
<p>Timed mental arithmetic PowerPoints with a visible 10 second countdown leading to one answer. </p>
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<p>Timed mental arithmetic PowerPoints with a visible 10 second countdown leading to one answer. </p>
Challenge_countdown_beg_1.ppt
Challenge_countdown_beg_2.ppt
Challenge_countdown_beg_3.ppt
Challenge_countdown_beg_4.ppt
Challenge_countdown_beg_5.ppt
Challenge_countdown_beg_6.ppt
Challenge_countdown_beg_7.ppt
Challenge_countdown_beg_8.ppt
Challenge_countdown_beg_9.ppt
Challenge_countdown_beg_10.ppt
Handout, Presentation, Worksheet | Grades 6-8