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The Japanese word

算数

is pronounced
sansuu | さんすう
means
arithmetic
Examples:
算数は数を取り扱う。
sansū wa kazu o toriatsukau.
Arithmetic deals with numbers.
算数では正確さが重要だ。
sansū de wa seikaku sa ga jūyō da.
Accuracy is important in arithmetic.
彼は簡単な算数すらできなかった。
kare wa kantan na sansū sura deki nakatta.
He couldn't do even simple arithmetic.
その子は算数ならどんな問題でも解ける。
sono ko wa sansū nara donna mondai de mo tokeru.
The boy can solve any problem in arithmetic.
Examples sourced from tatoeba.org