A.456×23=1488 | B.703×15=7090 | C.79×56=4424 |
A.3 | B.4 | C.5 |
A.9990 | B.990 | C.9900 |
A.十位 | B.百位 | C.千位 |
A.68×48≈2800 | B.59×64≈3600 | C.72×58≈3500 |
A. | B. | C. |
A.184 | B.45500 | C.70000 |
A.7200 | B.8460 | C.8520 |
A.78×85×17×=78×(85×17) | B.28 ×101=28 ×100+28 |
C.125×16×25=125×8+8×25 |
A.345÷10÷5 | B.345÷5÷3 | C.345÷5×3 |