文档介绍：苏教版小学数学三年级下册口算题 1. 40-2= 70+90= 70+2= 140-7= 70+50= 421 ÷7≈ 52+35= 720 ÷ 8= 9× 799 ≈9× 799= 80 ÷ 4= 26+9= 2. 45 × 28 ≈ 160-60= 160 ÷ 8= 150+40= 2100 ÷ 3= 50 × 80= 28 ÷ 7= 500 × 4= 24 ÷ 8= 12 × 20= 35 ÷ 5= 50 ÷5 = × 800 = 420 ÷7=3× 220 = 480 ÷4= 58 + 33 = 420 - 20 = 93 ÷3 = 880 ÷4 = 1200 - 200 = 11 ×7= 80 - 46 = 82 ÷9≈ 4. 45+45= 50 × 90= 42 × 98 ≈5× 5+52= 90+30= 90+40= 170-90= 110-30= 50+80= 110-80= 50+90= 400+300= 5. 21 × 30 = 660 ÷6= 65 × 10 = 540 ÷6= 22 × 40 = 80 × 80 = 10 × 47 = 30 × 70 = 0÷ 93 = 600 ÷6= 10 × 36 = 660 ÷3= 6. 43 + 38 = 720 ÷8= 36 + 56 = 23 × 30 = 10 × 73 = 90 × 50 = 800 ÷8= 6000 + 2000 = 120 ×4= 640 ÷2= 52 × 94 ≈ 250 ÷ 5= 7. 63 ÷ 9= 280 ÷ 4= 50 × 50= 810 ÷ 9= 300 × 6= 25+41= 140 ÷ 7= 20 × 31= 90-65= 52 × 44 ≈ 74 × 54 ≈ 41 × 75 ≈ 8. 40 × 70 = 131 ÷6≈ 900 ÷3= 57 + 29 = 125 ÷2 ≈4 ×9 ÷ 6= 90 ÷ 9= 1600 ÷ 2= 71-68= 600 ÷ 1= 1500 ÷ 3=9× 300= × 200 = 620 ÷2 = 660 ÷2 = 640 ÷8 = 880 ÷4= 7500 - 500 =0÷ 91 = 12 ×4= 3× 31 = 58 + 26 = 120 ×4 =0× 97 = 10. 360 ÷9= 44 ×2= 960 ÷3= 32 ×2= 2× 440 = 460 ÷2 = 70 + 500 =3× 33 = 280 ÷4=9× 400 =3× 330 = 690 ÷3= 11. 11 × 40 = 900 ×5 = 67 - 49 = 200 ÷4 = 8000 - 1000 = 20 × 24 = 57 + 29 = 540 ÷6= 10 × 73 = 10 × 58 =0÷ 49 = 34 × 20 = 12. 80 × 90 = 30 × 70 = 120 ×4= 640 ÷8= 720 ÷9 = 10 × 34 = 65 × 10 = 660 ÷3 = 700 ×5= 41 × 20 = 7000 - 3990 ≈ 30 × 30 = 13. 10 × 47 = 30 × 23 = 660 ÷6= 5900 - 5000 = 11 × 40 = 70 × 40 = 10 × 36 = 6000