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Adding and subtracting positive and negative numbers

We learnt how to add and subtract 1 digit positive and 1 digit negative numbers.

Cupman showed us his garden where he was counting lumps of earth (1). 

One day he went into the garden and found a hole (-1). 

He filled the hole with a lump of earth to make the ground flat (0). 

When we were adding we had to fill in the holes with lumps of earth using our 1 and -1 cards. 

When we were subtracting we had to make the level ground 0, into a lump and a hole 1, -1 so that we could work out the Maths Story. 


Can you teach someone how to do it?