口算. 500×2=________ | 400×5=________ | 7×30=________ | 28÷7=________ |
40÷5=________ | 53+7=________ | 28÷4=________ | 49+6=________ |
100-49=________ | 3600÷3=________ | 47-28=________ | 32÷8=________ |
230×7=________ | 55×4=________ | 789×0=________ | 500×8=________ |
1-=________ | +=________ | -=________ | +=________ |
比一比
4.46×1.3________4.46 | 1.06×0.99________0.99 | 9.4÷1.2________9.4÷0.12. |