北师大版五年级下册-口算题训练培训讲学.doc

口算训练

+ = ÷ = × = - = + =

+ = + = + = + =

+ = ÷ = × = - = 1 + =

2.5×4= 1.25×80= 1÷ = × = ÷ =

÷ = ÷= ÷ = ÷= × =

4 ÷ = × 17 = 10 ×= × 12 = ×8=

×12= 8×1.25= 99×17= 1÷0.25= 14÷ =

×5= 1÷= 25×= 30× = ×=

5X+X= n + n= - = m- m= + =

÷= + = ÷ = ÷= × =

-- = + = ÷ = -= -=

+= ÷ = ÷= += ×=