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First you need to write your sum.This is what it should look like. 1200+1001=? Lets work it out! So you have to start at the right and add the two numbers together. 1200 1001+ 2201 2201 IS OUR ANSWER Now we know that 1200+ (More)
289463-168273 = 7947+2244= No calculator but you can use any methods.     (More)