892×57=50844;705×52=36660;840×90=75600;690×98=67620505×60=30300;989×80=79120.
=505×4÷100 =5.05×4 =20.2
56×43=2408; 56 × 43 . 168 224 . 2408 172×21=3612; 172 × 21 . 172 344 . 3612 505×60=30300; 505 × 60 . 30300 240×80=19200. 240 × 80 . 19200
505 x 45 ____ 2525 2020 _____ 22725
32×216=6912 216× 32. 432 648 .6912505×80=40400 505× 80 .4040022×750=16500 750×22. 150 150 .16500
(1)505×8=4040 505× 8. 4040 (2)315×6=1890 315× 6. 1890 (3)420×9=3780 420× 9. 3780