21:42 Mental Math Tricks - Addition, Subtraction, Multiplication & Division!
Clear run-through of quick mental tricks for multiplying and dividing in your head.
Mental methods - multiplication and division
Use mental methods for multiplication and division of integers
2 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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2 shown 21:42 
2:04 Long Multiplication - Years 5 & 6
Shows the mental shortcut for multiplying and dividing whole numbers by 10, 100 and 1000.