



 
Hi Megan, You could try to approximate the sum by expressing the decimals to say 6 places and adding.
From this you can see that if you had expressed the decimals to 7 places the sum would be 1.2222221 and to 8 places 1.22222221 and so on. Hence it looks as if 0.9 repeated plus 0.2 repeated is 1.22222... This might look strange since 1 plus 0.2 repeated is 1.22222... , but that's because 0.9 repeated is 1. I hope this helps,  


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