This video explores adding with decimals. If needed, encourage your child to look at the year 3 or 4 videos for adding with exchanging (when you have more than 10 in a column).
This video explores subtraction with decimals. Please have a look at the addition with decimals video above to give further insight into the place value columns for decimals, if needed.
This video explores one strategy for multiplying 2 or 3 digit numbers by 1 digit numbers.
This video explores the 'bus stop' method of short division. The video was made for year 6 but is the same method for year 5. In year 5 the children solve up to 4 digit numbers divided by 1 digit numbers whereas in year 6, the children solve up to 4 digit numbers divided by 1 or 2 digits.