8.直接写出得数
380÷19= | 40×100= | 2020÷20= | 70×30= |
0.6+0.3= | 6.35+2.47= | 7.8-2.1= | 1-0.97= |
25+48÷24= | 33+44-15= | 15×4×8= | 275-75÷5= |
4.口算.
0 159416 159424 159430 159434 159440 159442 159446 159452 159454 159460 159466 159470 159472 159476 159482 159484 159490 159494 159496 159500 159502 159506 159508 159510 159511 159512 159514 159515 159516 159518 159520 159524 159526 159530 159532 159536 159542 159544 159550 159554 159556 159560 159566 159572 159574 159580 159584 159586 159592 159596 159602 159610 199269
1520+180= | 105×2= | 6+3×2= | 420-170= |
45×3= | 7×7-1= | 750+1250= | 350×2= |
9×9+3= | 1000-340= | 123×2= | 55×1+8= |
920-900= | 1360×2= | 108×2+15= | 570+230= |
980×0= | 200+20×5= | 360+640= | 209×3= |
27÷3-9= | 621-20= | 400×5= | (1500-800)+7= |
1500-500= | 104×4= | 168+168×0= | 1230+1700= |
160×5= | 55×0×7= |