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CCSS.Math:

we're asked to add zero point eight two two two five point six five so let me rewrite this so and let me know when I rewrite it I want to line up the decimal so that we add the right place to the right place and so we could write either number first although I like to write the larger number first so let's write five point six five and remember the important thing is that we line up the decimal points so if we if we write zero point eight two two so we line up the decimal let me line up the decimal first so I'll write the decimal right below the other decimal and it is zero point eight two two and now we are ready to add we are ready to add so let's see what's going on here so I like to start in the smallest place that way the carrying works out well so you might say wait I need to add this mm to something I don't see anything up here well you could say there's just a zero thousands right up here and then it makes it very clear well zero thousandths plus mm is going to be mm five hundredths plus two hundredths is seven hundredths six tenths plus eight tenths is fourteen tenths well 14 tenths is the same thing as four tens and one one another way of thinking about is you're carrying the one but really what you're saying is look this is fourteen ten so I could write that as four tens and a 1 and the or ones place or what in the ones place and you have 1 plus 5 is 6 and of course you cannot forget the decimal the decimal goes right there and this is six point four seven two