# Cathgildart's Shop

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#### Subtraction - exchanging

(31)
This uses £1 (100's), 10pences (10's) and pennies (units) to show what is being done when exchanging. I called it subtraction by borrowing as that's what most teachers and pupils say. I prefer exchanging, as this is what is actually being done. Borrowing comes from the other method taught in the past, where the borrowed one is paid back.

#### Short division

(31)
Uses £1's (100), 10p's (10) and 1p's(units) to show how 'bus-stop' division works.

#### Exact trig values of 0/30/45/60/90

(0)
This is a way to remember the exact trig values needed for higher GCSE using your left hand. There is a sheet to hand out that can be stuck in pupils’ exercise books as a reminder and a powerpoint explaining the method. It’s taken me a long time to write this so just trying to get some money for the time I put in. Thanks

#### Chunking division

(3)
Shows how we can use our knowledge of tables facts to 10x10 and products of multiples of 10 to divide by a single digit with an answer greater than 10.