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we've got three bananas here one two three so I'm starting with three bananas and I want to add some number of bananas so that I end up with ten bananas so this is what I'm starting with I'm starting with three and I want to end up with ten one two three four five six seven eight nine ten so what do I have to add to the three to get to ten and I encourage you to pause this video and try this out on your own so let's work through this so let's just start adding bananas so that's three so now let me add a fourth that would be my fourth banana five bananas six bananas seven bananas eight bananas nine bananas and ten bananas so how many bananas did I add so now I added some number of bananas here so in total I have one two three four five six seven eight nine ten so how many did I have to add to the three in order to get to that the total of ten in order to get this 10 right over here well we could just count these this is one this is two this is three four five six seven I added seven bananas I added seven bananas to the original three bananas to get to 10 so three plus seven is equal to 10 and you can see that what we have on this left side is indeed equal to what we have on the right side on the left side we have 1 2 3 4 5 6 7 8 9 10 bananas and on the right hand side we have 1 2 3 4 5 6 7 8 9 10 so they are indeed equal