第2单元 公顷和平方千米-【优佳好】2023-2024学年四年级上册数学口算计算能力提升（人教版）

单元 2 　 第 1 课时　 公顷的认识 4 年级 上 R 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　106 × 5 = 90 × 30 = 456 ÷ 2 = 31 × 70 = 810 ÷ 2 = 468 ÷ 3 = 55 × 3 = 67 × 2 = 3. 4 + 2. 7 = 57 × 20 = 100 × 20 = 504 × 2 = 260 × 2 = 105 ÷ 3 = 505 ÷ 5 = 602 ÷ 2 = 720 ÷ 3 = 803 × 5 = 660 ÷ 4 = 48 × 30 = 390 ÷ 5 = 43 × 20 = 320 ÷ 4 = 74 × 20 = 51 × 30 = 840 ÷ 6 = 824 ÷ 8 = 3. 6 - 1. 6 = 270 + 110 = 9 × 110 = 640 ÷ 8 = 350 + 50 = 720 - 460 = 2. 5 - 0. 9 = 480 × 2 = 160 ÷ 4 = 15 × 40 = 40 × 80 = 420 ÷ 7 = 180 × 3 = 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　35 × 48 = 423 ÷ 5 = 675 ÷ 5 = 240 ÷ (66 - 64) (102 - 98) × 240 (50 + 70) ÷ 4 71 单元 2 　 第 2 课时　 平方千米的认识 4 年级 上 R 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　12 × 11 = 402 + 204 = 370 - 190 = 108 ÷ 9 = 130 × 5 = 744 ÷ 8 = 801 + 18 = 360 ÷ 9 = 66 - 64 = 125 × 8 = 232 ÷ 4 = 180 × 3 = 420 × 4 = 408 × 7 = 425 - 310 = 357 ÷ 7 = 63 × 70 = 120 ÷ 5 = 376 - 200 = 18 × 30 = 6 × 800 = 540 ÷ 6 = 300 ÷ 6 = 490 ÷ 7 = 510 - 490 = 124 + 82 = 102 ÷ 3 = 57 × 20 = 260 × 2 = 45 × 30 = 504 × 2 = 105 ÷ 3 = 80 × 55 = 505 ÷ 5 = 630 ÷ 7 = 320 ÷ 8 = 210 ÷ 3 = 408 × 5 = 305 ÷ 5 = 276 - 142 = 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　48 × 23 = 327 ÷ 6 = 845 ÷ 3 = (290 - 54) ÷ 4 400 ÷ 8 × 23 642 ÷ 3 + 355 81 单元 2 　 第 3 课时　 练习课 4 年级 上 R 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　120 × 30 = 730 + 120 = 420 ÷ 6 = 156 - 124 = 580 - 475 = 250 × 4 = 357 ÷ 7 = 68 × 40 = 52 × 60 = 43 × 40 = 248 ÷ 4 = 400 × 3 = 65 × 80 = 735 ÷ 7 = 138 ÷ 2 = 132 × 2 = 252 ÷ 6 = 50 × 80 = 318 ÷ 3 = 280 × 5 = 128 + 372 = 680 ÷ 4 = 520 + 380 = 104 ÷ 8 = 29 × 50 = 817 - 717 = 28 × 50 = 72 × 20 = 896 ÷ 8 = 320 × 4 = 3. 2 + 4. 6 = 390 - 266 = 8. 5 - 6. 4 = 4. 4 - 3. 2 = 6. 9 - 2. 7 = 102 + 562 = 6. 3 + 3. 1 = 3. 7 + 1. 2 = 8. 9 - 3. 5 = 5. 7 + 5. 5 = 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　13. 4 - 7. 8 = 37 × 52 = 642 ÷ 3 = (23 + 135) × 9 36 × (420 ÷ 6) 325 + 175 - 222 91 单元 2 　 第 2 单元计算易错专练 4 年级 上 R 1. 直接写出得数。