I.Cộng, trừ, nhân, chia số có ba chữ số 657 + 92 385 + 409 42+ 365 648 –75 682 – 349 690- 358. ..................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................................................................................................................................... 54x 6 170 x 4 217 x 3 157x 4 72 : 6 86:4 56: 5 864 : 8 ..................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................................................................................................................................... 236 + 248 672 + 109 37 + 256 345 +39 456+ 362 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 456 – 238 657- 186 769- 85 378- 87 506- 385 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 205 x 4 360 x 2 234 x 3 105 x 6 109 x 8 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 484 : 4 650 : 5 628: 3 726: 6 742: 7 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................