一、口算。
$52 + 39 =$ $60 ÷ 3 =$ $41 × 2 =$
$28 × 4 =$ $0 ÷ 69 =$ $92 - 24 =$
$29 + 13 =$ $62 - 18 =$ $52 ÷ 2 =$
$96 ÷ 2 =$ $8 × 42 =$ $64 × 2 =$
$300 × 7 =$ $470 + 50 =$ $440 ÷ 4 =$
$206 × 3 =$ $90 × 70 =$ $15 × 50 =$
$180 × 2 =$ $30 × 32 =$ $246 ÷ 3 =$
$268 ÷ 2 =$ $903 ÷ 3 =$ $83 × 20 =$
$501 × 7 =$ $400 - 210 =$ $840 ÷ 7 =$
$10 × 53 =$ $470 ÷ 5 =$ $68 × 30 =$

一、91 20 82
112 0 68
42 44 26
48 336 128
2100 520 110
618 6300 750
360 960 82
134 301 1660
3507 190 120
530 94 2040

二、在$◯$里填“＞”“＜”或“=”。
$\dfrac{1}{2}◯ \dfrac{1}{4}$ $\dfrac{1}{8}◯ \dfrac{1}{3}$ $\dfrac{1}{7}◯ \dfrac{1}{4}$ $\dfrac{1}{5}◯ \dfrac{1}{5}$
$\dfrac{1}{8}◯ \dfrac{1}{4}$ $\dfrac{1}{3}◯ \dfrac{1}{9}$ $\dfrac{1}{2}◯ \dfrac{1}{5}$ $\dfrac{1}{7}◯ \dfrac{1}{5}$
$\dfrac{1}{3}◯ \dfrac{1}{4}$ $\dfrac{1}{9}◯ \dfrac{1}{7}$ $\dfrac{1}{6}◯ \dfrac{1}{2}$ $\dfrac{1}{4}◯ \dfrac{1}{6}$
$\dfrac{1}{7}◯ \dfrac{1}{2}$ $\dfrac{1}{3}◯ \dfrac{1}{6}$ $\dfrac{1}{2}◯ \dfrac{1}{2}$ $\dfrac{1}{5}◯ \dfrac{1}{4}$

二、＞ ＜ ＜ =
＜ ＞ ＞ ＜
＞ ＜ ＜ ＞
＜ ＞ = ＜