一も二も無く[ichimonimonaku] unhesitatingly
一言二言[hitokotofutakoto] a word or two
一石二鳥[issekinichou] killing two birds with one stone
一二に及ばず[ichininioyobazu] right away
一姫二太郎[ichihimenitarou] It's good to have a girl first and then a boy

うり二つ[urifutatsu] as alike as two melons (two peas in a pod)
黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac
二度[futatabi] again
最小二乗法[saishounijouhou] least-squares method
三十二分音符[sanjuunibuonpu] 32nd note

黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac
丸十[marujuu] cross in a circle
五十音[gojuuon] the Japanese syllabary
五十音順[gojuuonjun] the syllabary order
五十三次[gojuusantsugi] the 53 Toukaidou stages

五十年祭[gojuunensai] jubilee
五十歩百歩[gojuppohyappo] six of one and a half dozen of the other
五十路[isoji] age fifty
三十戸[sanjikko] thirty houses
三十三所[sanjuusansho] any of a number of sets of thirty-three holy places enshrining Avalokitesvara (esp. those comprising a popular pilgrimage in the Kinki region)

絵に描いた餠[enikaitamochi] pie in the sky
絵描[ekaki] painter
弧を描く[kowoegaku] to draw an arc (e.g. with a compass)
自然描写[shizenbyousha] description of nature
手描[tegaki] handwriting

描き分ける[kakiwakeru] to distinguish in writing
心理描写[shinribyousha] psychological description
人物寸描[jinbutsusunbyou] thumb-nail sketch
素描[sobyou] drawing
点描[tenbyou] dotting

影絵[kagee] shadow picture
下絵[shitae] rough sketch
絵にかいた餅[enikaitamochi] pie in the sky
絵具[enogu] colors
絵画[kaiga] picture

絵巻[emaki] picture scroll
絵巻物[emakimono] picture scroll
絵図[ezu] illustration
絵日記[enikki] diary with illustrations