2023﹣55=
12.8+8.21=
1.4×5=
30×120=
×=
÷=
5﹣2=
×4÷×4=
425﹣198=
40×12.5%=
0.57+0.3=
28÷0.28=
①5.7×+1.3÷
②(+﹣)÷
③÷8×(÷)
④32÷32
⑤7.75×+25%×0.125
⑥73×25%+×26+0.25
……
4根
7根
10根小棒
143×7=1001
143×14=2002
143×21=3003
143×28=
143×=8008