I show a shortcut for 2-digit multiplication problems when one of the factors is a multiple of ten, such as 78 x 50. In such cases the answer is the same as 78 x 5 with a zero tagged to the end. We can write that zero first, and then multiply as if we were multiplying 5 x 78. (Of course this same shortcut works also if one of the factors is a multiple of 100 or 1000 etc.)
The lesson also includes one word problem involving area and a calculation where we need to consider the order of operations. The lesson is meant for 4th grade math.
See also my other videos for 4th grade at http://www.mathmammoth.com/videos/grade_4/math_videos_4th_grade.php
Tagged under: multiplication,2-digit,factor,multiple ten,4th grade,math
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