5.3×1.25.3 5.43×0.99 5. 43 4.84×0.90.9
12×20=
0.56-0.44=
25×17×4=
380-51-49=
8.21+0.79=
0.8+4.7=
0.56×100=
3009÷100×10=
①278×99
②78×[(360-60)÷3]
③156×4-56×4
④7200÷25÷4