In Japanese, depending on what you are going to count, you have to add a special counter word after the number.
This is very similar to how you say “one loaf of bread” or “one slice of bread” in English. The Japanese equivalents would be パン一斤 (“bread one-loaf”) and パン一枚 (“bread one-flat piece”).
Below, you can find a Japanese counters cheat sheet covering some of the more common counter words.
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