1.5×4= 
2.5×4 = 
0.13× 4= 
2.4-0.8= 
4.2×1000= 
O .75+0.8 = 
8.5×100= 
0.18×0.3= 
O .04×25= 
1000×0.756= 
0.5×100= 
2.5×1.47×0.4= 
1.25×8= 
3.8×2= 
1.6×0.2= 
2.5x3 
3.1x5 
2.1x9 
8.9x20 
6.8x3 
5.5x5 
2.5x4 
0.125x4 
3.3x4 
5.7x4 
6.5x7 
2.2x4 
3.5x5 
4.6x6 
255x0.125 
3.6x7 
3.5x7 
3.2x2 
3.4x2 
1.5.06*60+4.94*60 
2.62.5*1000-61.5*1000 
3.98.54*99+98.54 
4.9.3*10-9.3*9 
5.0.25*4+1.25*0.8
