22×2 =                  24÷2=                  20÷4=                20×30=
14×2=                   50×50=                200÷4=              320÷8=
305÷5=                  60×60=               103×7=              312×3=
800－792=              45＋55=                68＋32=              32×30=
64×5=                     20×33=               310×3=               14×20=
328－99=                 31－17=               180÷9=                400÷4=
11×80=                   728÷8=                30×70=               279÷9=
40×5=                    103×7=               107×8=                476＋99=
12×10=                    30×12=               10×10=                80÷8=
305×4=          213×4=        404×7=        501×7=
210×3=          56÷7=         45÷9=         55÷6≈
250÷4 ≈        43÷6 ≈       13÷4 ≈       99×2≈
31×11 ≈        69×12 ≈      26÷5 ≈       36÷3=
82÷2=           52÷4=         76÷2=         33÷3=
206÷2=          484÷4=        122÷2=        300÷5=
1500÷5=         2800÷7=       900÷5=        909÷3=