文档介绍：口算(一) 200+180= 56+125= 400-70= 71+28= 6× 8= 36-18= 35 ÷ 5= 90+150= 78 ÷ 9= 45-27= 720-180= 9× 9= 910-90= 38 ÷ 7= 220+150= 6× 9=6× 7= 40 ÷ 8= 290-40= 770-160= 600+270= 620+150= 3× 7=7× 7= 37 ÷ 6= 56 ÷ 9= 760+100= 750+125= 4× 6= 19 ÷ 8= 200+50= 430+27= 720-70= 820-128= 33-17= 71-43= 81 ÷ 9= 72 ÷ 8= 71-24= 250-60= 28 ÷ 7= 33 ÷ 6= 66 ÷ 8=5× 5= 15+43= 58-36= 6× 6= 60+350= 840+90= 5× 9= 43 ÷ 7= 460-72= 34+23= 34+56= 13 ÷ 6=9× 4= 30+540= 620-57= 11 ÷ 5= 67-53= 口算(二) 52+81= 9× 9= 83 ÷ 9= 330-172= 38+52= 5× 6= 8× 6= 62+52= 41 ÷ 5= 75+75= 70+18= 5× 4= 36 ÷ 6= 70-18= 900-80= 70+450= 58+14= 78-23= 36 ÷ 7= 44 ÷ 6= 94-46= 7× 8=8× 7= 52 ÷ 7= 6× 4= 500+700= 30+38= 84-12= 4× 4=2× 2= 2300-500= 44+23= 7× 2= 520-30= 980-400= 6× 3= 750+60= 8× 1=8× 2= 17 ÷ 5=8× 3= 26 ÷ 6= 300+70= 760-500= 38 ÷ 7= 700-300= 270-80= 7× 3= 22 ÷ 7= 100-45= 8× 4=2× 6=9× 6= 33 ÷ 6= 370-230= 69+30= 32 ÷ 4=1× 1= 120-30= 5× 4= 口算(三) 200+90= 69+40= 9× 2=6× 3= 26+36= 19+47= 67 ÷ 8= 64 ÷ 8= 220+170= 4× 7= 19 ÷ 6= 21 ÷ 6= 69+32= 680-120= 770+630= 3× 3= 25 ×4= 450 ×0= 120 - 40 = 402 ×5= 360 - 90 = 11 + 60 = 630 ×3= 560 + 40 = 72 - 24 =9+ 50 = 630 + 70 = 120 ×5= 250 ×5= 14 + 40 = 24 ×5= 70 ×8= 880 ×2= 40 ×8= 57 - 28 = 801 ×9= 120 + 20 = 250 ×1= 28 + 68 = 100 ×0= 902 ×1= 17 ×4= 30 ×6= 18 ×3= 68 -4= 48 - 16 = 70 ×2= 200 ×8= 280 - 70 = 320 ×8= 30 ×6= 180 - 60 = 560 + 80 = 150 ×2= 140 -5= 125 ×8= 700 ×2= 72×3= 42+ 30= 902 ×6= 口算(四) 120