50-31=
96-23=
40+25=
23+37=
49+8=
68-28=
100-50=
82-8=
33-7=
16+50=
85-40=
29+9=
2×7= 6×3= 4×9= 9×2=
7×8= 9×7= 6×6= 6×8=
6×3+6= 7×5+7= 4×9+9=
7×8-8= 1×9-9= 8×7-7=
①53+34=
②76-42=
③19+49=
④78-38-13=
⑤33+26+18=
⑥91-(63+19)=
31-2=
92-50=
2×6=
2×2+4=
36+3=
66+9=
3×3=
5×2+5=
13+45=
42+8=
5×5=
4×3-2=
3×7= 4×6= 23+27= 9+76= 2×3=
6×6= 45+21= 67+7= 40-13= 25-16=
8×2= 81-18= 6×9= 30-2= 18+37=
2×5+9= 4×7+7= 48-18-12= 7×8-20= 5×7-5=
4×4= 86-54= 3×6= 5×6= 9×4=
8×3= 98-38= 5+15-6= 3×5= 1×2=
68-47= 33+24= 5+35= 2×4+2=
39-28= 3×3= 1×6= 4×6-5=
56=11 48=32 729×8 24÷47
459=5 96=54 93=3 99=0
180÷6= += ÷3= ×=
6﹣3.3= 2.2+3.57= ﹣= 39.5÷8≈(估算)
0.125×4= ×12= := 8×÷8×=