一、口算。
760 - 380 =
125÷5 =
(120 - 20)÷5 =
630÷7 =
410×6 =
25×6×4 =
520×4 =
960÷60 =
198 - 75 - 25 =
106÷2 =
75 + 75 =
84 - 16÷4 =
35×30 =
125×80 =
(85 - 15)×5 =
990÷90 =
200÷4 =
5×24 - 20 =
240 + 160 =
83 - 26 =
72÷9×8 =
20×26 =
120×40 =
45 + (80 - 23) =
96 - 69 =
450÷90 =
75×10 + 25 =
246÷6 =
18×7 =
36÷4×5 =

周四
一、380 25 20
90 2460 600
2080 16 98
53 150 80
1050 10000 350
11 50 100
400 57 64
520 4800 102
27 5 775
41 126 45

二、在$\square$里填数，在$\bigcirc$里填运算符号。
(26 + 32)×4 = $\square\bigcirc4+\square\bigcirc4$
36×(20 + 3) = 36$\bigcirc\square+36\bigcirc\square$
(18 + 25)×8 = $\square\bigcirc8\bigcirc\square\bigcirc8$
43×28 + 57×28 = ($\square\bigcirc\square$)×28
125×(80 + 2) = 125×$\square\bigcirc125×\square$

二、26 × 32 ×
× 20 × 3
18 × + 25 ×
43 + 57
80 + 2