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.184 | B.45500 | C.70000 |
A.78×85×17×=78×(85×17) | B.28 ×101=28 ×100+28 |
C.125×16×25=125×8+8×25 |
A.48×57+43×48=48×(57+43) |
B.75×26=26×75 |
C.136×25×4=136×(25×4) |
A.56×(4+1) | B.56×4+1 | C.4×(56+1) |
A.288÷18×2 | B.288÷6÷6 | C.288÷4÷9 |