2.如图,涂色的纸条长是( )
A. | 4厘米8毫米 | B. | 3厘米8毫米 | C. | 2厘米8毫米 | D. | 5厘米 |
1.一袋大米50千克,( )袋大米总重恰好是1吨.
A. | 2 | B. | 10 | C. | 20 | D. | 200 |
13.口算
0 163641 163649 163655 163659 163665 163667 163671 163677 163679 163685 163691 163695 163697 163701 163707 163709 163715 163719 163721 163725 163727 163731 163733 163735 163736 163737 163739 163740 163741 163743 163745 163749 163751 163755 163757 163761 163767 163769 163775 163779 163781 163785 163791 163797 163799 163805 163809 163811 163817 163821 163827 163835 199269
50×5= | 49+35= | 21×4= | 900×9= |
3×13= | 63×0= | 110×6= | 80-54= |
45÷6= | 71×2≈ | 49×3≈ | 102×6≈ |
198×5≈ | $\frac{1}{7}$+$\frac{3}{7}$= | $\frac{3}{5}$-$\frac{2}{5}$= | 1-$\frac{1}{4}$= |
$\frac{5}{5}$-$\frac{2}{3}$= | 12×3= | 25÷3= | 23-17= |
80+2= | 183×4≈ | 100-25= | 12×5= |
63+42= | 45+25= | $\frac{1}{3}$+$\frac{2}{3}$= | 50×2= |
16+7= | 30-5= | 56÷9= | 33÷4= |
5+4×0= | 20+13×2= | 5×2÷5×2= |