in a way that involves adding, subtracting (= removing a number or amount), multiplying, or dividing numbers: Students can attack the problem arithmetically.

What is the adjective form of arithmetic?

arithmetic \ ˌer-​ith-​ˈme-​tik \ or arithmetical \ -​ti-​kəl \ adjective.

Can arithmetic be used as an adjective?

As detailed above, 'arithmetic' can be an adjective or a noun. Adjective usage: arithmetic progression. Noun usage: arithmetic test.