题目内容
| 口算. 32×30= | 17×3= | 23×11= | 10÷7= | 300×3= |
| 756-45= | 3000÷6= | 190×2= | 790-450= | 40×80= |
| 720+58= | 24×5= | 198+302= | 191×61≈ | 309×42≈ |
| 32×30=960, | 17×3=51, | 23×11=253, | 10÷7=
| 300×3=900, | ||
| 756-45=711, | 3000÷6=500, | 190×2=380, | 790-450=340, | 40×80=3200, | ||
| 720+58=778, | 24×5=120, | 198+302=500, | 191×61≈12000, | 309×42≈12000. |
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