=
+=
-=
0.15=
1-=
+3=
0.6-=
4-=
291×0=
870×8=
60×5=
28-8÷4=
204+198≈
583-484≈
505×5≈
296×6≈
22+38=
78-25=
450-360=
408+396≈
279+30=
584-181=
7×0=
289×4≈