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どうして贈り物の場合は、日本では偶数は嫌われる?

結婚式のご祝儀や知人が亡くなった時の葬式の香典では、2や4といった数字の金額は持って行かないのがマナーです。その理由は、偶数は「割り切れる数字」だから。「割れる」→「切れる」というイメージにつながるので縁起が悪いのです。ちなみに、香典では新札を入れるのも失礼。それだと、まるでご不幸を見越してお金の準備をしていたように思われてしまいます。どうしても新札を使う場合には、一旦二つに折ってから袋に入れしょう。逆に、ご祝儀のお札は、新札を用意するのがマナー。結婚式の招待状が届くのは当日の2~3ヵ月前。「新しい門出を祝福するために、前もって準備していたにゃ!」という気持ちが伝わります。

Why are ' even' numbers disliked

for a gift of money in Japan

"Goshugi(ごしゅうぎ)" is a gift of money in a special envelope for someone at a celebratory occasion such as a wedding."Kouden(こうでん)" is a condolence gift of money in a special envelope for a funeral.
In those ceremonies, avoid giving even numbers of money like 2,4 ,etc as a courtesy in Japan.
The reason is because even numbers can be divided, and division reminds you of a split or break up.It is bad luck for those ceremonies. 
As for "Kouden(こうでん)", the bills should be old, not new.Offering a new bill at a funeral could give the appearance that the death was expected and you had time in advance to prepare “new” bills for the occasion.If you have no choice but to use a new bill, fold it in two and put it in an envelope.
On the other hand, you need new bills for "Goshugi(ごしゅうぎ)" to celebrate a wedding. You generally receive an invitation card a couple of 
months before the ceremony. New bills show your feeling as you have prepared new bills to celebrate the new life of the newlyweds.