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  1. Kiám-chhái檢彩 tōe-kiû地球 hun tsòe 12 kiong koh chi̍t kiong thàn ji̍t-thâu日頭 ê lō͘ ū 6806・8 , chīu tùi tōe-bīn地面 kàu tōe-kiû-sim地球心 kúi-lí? Tek 13000.
  2. Kiám-chhái檢彩 phah-kiû-po͘, îⁿ-îⁿ-ê, an tiong-sim中心 kè-khì 50 tn̄g. Hit-po͘ kúi-bó͘? Tek 32・725.
  3. Kiám-chhái檢彩 lâi se̍h ge̍h tio̍h kiâⁿ 22833 , chīu tùi ge̍h-bīn月面 kàu tiong-sim中心 kúi-lí? Tek 3634.


NIÛ-CHHNG

Khòaⁿ téng-bīn頂面, niû-tiân hit-ê彼个 tô͘, siat-sú設使 múi sù-hong-keng téng-bīn頂面 ū hē chi̍t-khia-siuⁿ-á, múi-bīn chi̍tchhioh sù-hong四方, chīu toh-téng ū chi̍t-ûn siuⁿ-á, koâiⁿ chi̍tchhioh: siuⁿ-á ê gia̍h 24 khia. Hē koh chi̍t-ûn, chīu siuⁿ-á 2 chhioh koâiⁿ, koh i-ê gia̍h = 24 × 2 = 48. Lâi koh hē, gia̍h éng = koâiⁿ × khoah × tn̂g. Tn̂g × khoah × koâiⁿ thang kiò-tsòe叫做 li̍p-hong-chek立方積.

Kiám-chhái檢彩 koâiⁿ , khoah, tn̂g ū kúichhùn, kúichhioh, á kúi chīu li̍p-hong-chek立方積 tsòe li̍p-hong-chhùn立方寸, li̍p-hong-chhioh立方尺 á li̍p-hong . Kiám-chhái檢彩 tn̂g, khoah, koâiⁿ tâng-chi̍t-ê gia̍h-siaⁿ額聲, chīusiong-sêng相乘 tio̍h hòa-tsòe化做 tâng.

Siat-sú設使 chi̍t-li̍p-hong-chhioh tsúi chhìn-tāng 1000 niú chīu chi̍t-khia-siuⁿ 3 1 chhioh 6 chhùn tn̂g, 2 chhioh 5 chhùn khoah, 1 chhioh 4 chhùn chhim, ōe kham-tit堪得 kúitàⁿ tsúi?

3 1 chhioh 6 chhùn tio̍h siá 3 1・6 in-ūi因為 10 chhùn 1 chhioh. Kî-û thang chiàu sió-sò͘小數 ê hoat lâi-kì. Lóng chiat tsòe chhioh, chīu siong-sêng相乘, tit-tio̍h得著 37・1 li̍p-hong-chhioh立方尺. Ēng 1000 lâi-sêng來乘, tit-tio̍h得著 kúiniú tâng. Hòa-tsòe化做 tàⁿ, tit-tio̍h得著 23 tàⁿ 18 kun 12 niú.