2×5=10
22×55=1210
222×555=123210
2222×5555=12343210
×=
610000560100005 40404404004044 830×4083×400
①25×61×4
②25×(4+8)
③56×99+56
④88×125
⑤25×68-28×25
⑥874+175+26+25
+ = 50÷50%= = 3 -1.125=
1.9÷2.5÷0.4= ( )×18= = 1- =