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The fourth grade elementary school mathematics second volume oral calculation problem.
The fourth grade oral arithmetic problem book 2-multiplication

2 1×4= 2 1×40= 2 10×4= 60×90= 600×8= 60×50=

43×2= 20×34= 3×230= 12×40= 70×20= 3×900=

60×90= 12×7= 12×70= 120×70= 800×90= 40×200=

35×20= 25×20= 500×30= 18×5= 25×4= 350×20=

14×5= 140×50= 28×30= 30×20= 40×40= 140×20=

1 1×60= 13×30= 130×30= 50×40= 40×200= 50×600=

30×3 10= 70×8= 4 10×20= 20× 10= 16× 100= 200×70=

50×200= 32×30= 13×300= 40×800= 12 1×4= 60×900=

10×460= 120×3= 20×500= 70×20= 250×4= 120×50=

15×30= 25×30= 250×3= 150×40= 25×300= 30× 150=

25×40= 45×200= 70×40= 150×4= 125×8= 125×4=

2 10×4= 200×40= 3 10×3= 80×90= 600×7= 600×50=

43×20= 20×35= 3×2 10= 120×60= 700×20= 30×240=

600×90= 12×8= 120×60= 500×70= 80× 100= 90×200=

350×20= 450×20= 500×20= 16×50= 45×4= 350× 10=

140×5= 14×30= 26×30= 60×200= 340×20= 180×50=

1 10×60= 1 1×300= 230×30= 550×4= 440×20= 50×800=

20×320= 700×8= 450×20= 200× 10= 17× 100= 500×70=

60×200= 34×30= 19×300= 80×800= 122×4= 70×900=

10× 100= 12×300= 50×500= 700×60= 125×8= 160×50=

The fourth grade oral arithmetic problem book 2-mixed operation

80÷2+ 100÷5= 45-20×3÷4= 240÷6-2× 15=

52-36÷3+20= 320-200÷5×8= 140-20×5+25=

20×30+20×40= 25×(30+ 10)= 800÷40-400÷40=

(840-400)÷4= 600÷( 120÷60)= 60÷( 10+ 120÷60)=

(600÷ 10+ 10)÷7= (26+ 14)×70= 260+ 14×(70-60)=

(26+ 14)×(70-40)= 90÷(30× 15÷50)= (35+45)÷(90- 10)=

6× 10-(2 1+29)= 25×(22+26×3)= 320-( 120+25×4)=

80÷(32+8)×300= 3000-[(32+8)×30]= 30×[ 169-(60+9)]=

36÷3+6×2= 30÷(3+6×2)= 36÷[(3+6)×2]=

180÷(36÷ 12)+6= 450÷[( 15+ 10)×2]= 240+ 180÷30×2=

(40+ 180÷30)×2= (240+ 180)÷(30×2)= 36+360÷ 12=

800-800÷80×30= 800-(70×6+ 180)= 65×(40+20×3)=

The fourth grade oral arithmetic problem book 2-algorithm

52+44+ 148= 78+ 125+75=

79+89+ 12 1= 25×62×4=

125×7×8= 70× 12×5=

32×25= 5×( 12× 1 1)=

560÷ 16= 70× 105=

65×5+35×5= 65×5+45×5=

65×50+35×50= 12×70+38×70=

5× 12 1+79×5= 45×6+35×6=

67×5-37×5= 120×90- 1 10×90=

39×8-6×39= 326×78-326×68=

125×(8+4)= 12×(40-5)=

68×48+68×52= 5×27+63×5=

64×9- 14×9= 23× 134-34×23=

43+43×99= 99×62+62=

48× 10 1-48= 102×45=

648+203= 63× 15×2=

44×25= 36× 10 1=

36× 102= 45×99=

256×7-56×7= 49×25×8=

79×32+79×68= 67× 10 1-67=