7.口算.
| 40×70= | 25×20= | 6×80= | 32×10= | 90×30= |
| 50×16= | 9×60= | 48×20= | 71×8= | 22×50= |
5.估算67×31的结果是( )
| A. | 1800 | B. | 2800 | C. | 2100 |
4.一幢大楼19层,每层4户.13幢这样的大楼一共住( )户.
| A. | 985 | B. | 885 | C. | 988 |
2.希望小学三年级有2个班,每个班平均47人,全校人数是三年级人数的9倍.希望小学一共有( )人.
0 157885 157893 157899 157903 157909 157911 157915 157921 157923 157929 157935 157939 157941 157945 157951 157953 157959 157963 157965 157969 157971 157975 157977 157979 157980 157981 157983 157984 157985 157987 157989 157993 157995 157999 158001 158005 158011 158013 158019 158023 158025 158029 158035 158041 158043 158049 158053 158055 158061 158065 158071 158079 199269
| A. | 942 | B. | 846 | C. | 864 |