I explain how to multiply by a two-digit number (standard multiplication algorithm). This involves two separate multiplications and lastly adding their results. In the second multiplication, one has to add a zero in the ones place. This is because we're actually multiplying by a multiple of ten (such as 70 or 40). (I explain that more in this video: https://youtu.be/g5T2PPKA4uM )
See also my other math videos for 4th grade at http://www.mathmammoth.com/videos/grade_4/math_videos_4th_grade.php
Tagged under: standard algorithm,multiplication,-digit,4th grade,math,algorithm,multiplication algorithm,multiply -digit
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