This video is about how to do multi-digit addition. The speaker explains the concept of place value and how to line up digits before adding them.

This video is about multi-digit subtraction. It teaches a trick on how to subtract a bigger number from a smaller one by borrowing from the neighbour digit.

This video is about adding and subtracting decimals. Mr. J explains the steps involved in solving these problems including lining up the decimals and using placeholder zeros.