# Japanese vocabulary list: Math and number terms

By | March 2, 2017

It’s been awhile since I’ve posted a Japanese vocabulary list, so I thought I would make one about mathematics and numbers (数学用語). I’ve purposefully left shapes out of this list and may make another list later just focusing on those.

(Interesting fact: In the 2015 PISA average scores, Japan scored #5 in math and #2 in science.)

If you have any ideas for a vocabulary list, let me know.

• 数学 (suugaku): mathematics
• 数学的 (suugakuteki): mathematical  (used as an adjective)
• 数字 (suuji): number
• 数 (kazu): number
• 桁 (keta): digit
• ３桁 (san keta): 3 digits
• 算数 (sansuu): elementary mathematics  [covers things like basic counting, shapes, addition, etc.]
• １＋２＝３  (ichi tasu ni wa san)
• 引き算 (hikizan): subtraction
• ３−２＝１ (san hiku ni wa ichi)
• 掛け算 (kakezan): multiplication
• ２ｘ３＝６ (ni kakeru san wa roku)
• 割り算 (warizan): division
• ８/４＝２ (hachi waru yon wa ni)
• 小数 (shousuu): decimal
• 3.2 (san ten ni)
• 分数  (bunsuu): fraction
• 5/3（san bun no go)
• 分母 (bunbo): divisor  (3 in this example)
• 分子 (bunshi): numerator (5 in this example)   [Note: also means molecule in physics]
• 約数 (yakusuu): divisor
• １０の約数 (juu no yakusuu): divisor of 10
• 倍数 (baisuu): multiple
• ５の倍数 (baisuu): multiple of 5
• 指数 (shisuu): exponent  [also index, as in ‘customer index’]
• 偶数 (guusuu): even number
• 奇数 (kisuu): odd number
• 非数 (hisuu): not a number (NAN)
• 無理数 (murisuu): irrational number
• 有理数 (yuurisuu): rational number
• 比 (hi): ratio
• ２対３ (ni tai san):  2:3  (radio of 2 to 3)
• 量 (ryou): amount
• 体積 (taiseki): volume
• 面積 (menseki): area
• 角度 (kakudo): angle
• ９０度 (kyuu juu do): 90 degrees
• 長さ (nagasa): length
• 重さ (omosa): weight
• 速さ (hayasa): speed
• 素数 (sosuu): prime number
• 整数 (seisuu): integer / whole number
• 実数 (jissuu): real number
• 虚数 (kyosuu): imaginary number
• 自然数 (shizensuu): natural number  [1,2,3,4,5…]
• 負の数 (fu no suu): negative number  [also 負数]
• 正の数 (sei no suu): positive number　[also 正数]
• 多い (ooi): many / more than   [10より多い  = more than 10]
• 少ない (sukunai): few / less than  [5より少ない = less than 5]
• 等しい (hitoshii): equal   [also イコール]
• 円周率 (enshuuritsu): PI (3.141592…)

Here is a site in Japanese with a few more: http://www.suriken.com/knowledge/glossary/grade01_06.html

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## 6 thoughts on “Japanese vocabulary list: Math and number terms”

1. Ganesh Jagnade

小数 (shousuu): decimal
3.2 (ichi ten ni)

kaite arukedo daijyoubu?

1. locksleyu Post author

goshiteki arigatou gozaimasu. naoshimashita.

2. Jai

How do you read something like 5 ^ 3 = 125 in Japanese?

1. locksleyu Post author

Exponentiation is expressed in Japanese with 乗 (jou)

5 ^ 3 = 125

ご　の　さんじょう　イコール　ひゃくにじゅうご

3. Michael Strain Jr.

Exact Pi Theory BY: Michael G. Strain Jr.

The Exact Pi Theory states that Pi can be figured out by using the volume of a sphere equation V=(4/3) Pi r^3 (source 1), and by taking the physical measurements of volume and diameter with particular methods we find pi. Then divide the diameter by 2 to find radius. Volume of a sphere can be measured by placing the sphere into a square (possibly airtight) container of water or liquid and measuring the displacement thus getting a square measurement of volume without using pi. Diameter can be measured by placing the sphere into a fitted square box or wrench with a measuring gauge thus measuring diameter. Pi would be the last variable left thus giving us an accurate value of Pi. Through the new measurement of Pi a new measurement of circumference can be made.

1. locksleyu Post author

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