数学好玩-【优佳好】2023-2024学年四年级下册数学口算计算能力提升（北师大版）

数学好玩 　 第 1 课时　 密铺 4 年级 下 B 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　0. 3 × 6 = 3. 2 + 2. 8 = 0. 64 × 0. 03 = 0. 63 × 2. 1 = 2. 7 + 0. 3 = 1. 4 × 0. 7 = 0. 5 × 0. 13 = 1. 3 × 0. 3 = 1. 13 × 50 = 2. 2 + 11 = 12. 8 × 0. 5 = 13. 6 × 2 = 5. 4 × 0. 5 = 0. 56 + 0. 8 = 0. 96 + 0. 16 = 3. 2 × 3 = 4. 5 × 0. 07 = 2. 1 × 9 = 88 × 0. 22 = 1. 11 × 0. 4 = 6. 3 + 0. 09 = 8. 9 × 20 = 22. 2 × 0. 04 = 81 × 0. 9 = 2. 5 × 0. 6 = 6. 8 × 3 = 55 × 0. 5 = 3. 5 × 0. 6 = 2. 5 × 3 = 5. 5 × 5 = 78 × 0. 4 = 99 × 0. 8 = 3. 1 × 5 = 3. 3 × 4 = 0. 88 × 0. 5 = 0. 72 × 5 = 19. 6 × 2 = 0. 8 × 1000 = 8. 6 × 0. 2 = 2. 1 × 3. 5 = 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　5. 3 × 300 = 1. 25 × 0. 12 = 0. 18 × 4. 45 = 20 - x = 1. 3 14x = 84 6x - 25. 12 = 4. 88 65 数学好玩 　 第 2 课时　 奥运中的数学 4 年级 下 B 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　0. 5 × 0. 4 = 7. 2 + 8. 8 = 0. 12 × 0. 7 = 5. 1 - 3. 8 = 2. 9 + 1. 3 = 0. 6 + 0. 4 = 0. 03 + 0. 4 = 3. 5 + 13 = 4. 8 + 4 = 1. 5 - 0. 9 = 1 - 0. 86 = 7. 8 + 2 = 5. 6 + 5. 6 = 4. 3 + 1. 8 = 0. 9 × 2 = 0. 75 + 0. 95 = 1. 6 × 8 = 1 + 2. 4 = 1 - 0. 84 = 1. 2 + 2. 1 = 3. 6 × 12 = 2. 5 - 1. 5 = 3 × 0. 3 = 130 - 79 = 0. 14 + 1. 7 = 4. 8 × 0. 6 = 14. 7 × 0. 7 = 3. 5 × 0. 2 = 1. 5 × 5 = 5. 4 × 0. 3 = 1. 25 × 0. 8 = 1 × 0. 25 = 0. 84 + 4. 6 = 3. 4 × 0. 4 = 4. 12 × 0. 4 = 5. 2 × 0. 5 = 0. 35 + 1. 6 = 1. 44 + 0. 9 = 3. 52 × 0. 2 = 1. 8 × 4 = 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　4. 36 + 2. 13 = 8. 51 - 7. 3 = 12. 4 + 32. 23 = x + 2. 4 - 4 = 1. 1 2x + 20 = 88 7x = 35 75 数学好玩 　 第 3 课时　 优化 4 年级 下 B 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　53 × 0. 01 = 0. 5 × 2 = 40 × 50 = 0. 35 + 3. 5 = 0. 02 × 0. 5 = 3. 5 - 0. 07 = 0. 5 × 4 = 4. 2 × 3 = 10. 8 × 9 = 1. 08 × 0. 1 = 3. 2 + 6. 9 = 0. 23 × 2 = 2. 8 × 10 = 9. 6 + 3. 2 = 2. 2 × 6 = 1. 8 × 100 = 200 × 0. 03 = 1. 3 + 0. 03 = 0. 55 × 200 = 8. 2 × 0. 01 = 9 × 0. 3 = 0. 3 × 0. 04 = 4. 8 + 0. 06 = 1. 05 × 0. 5 = 3. 2 × 0. 2 = 0. 22 × 30 = 0. 72 × 8 = 3. 06 × 50 = 3. 9 + 0. 39 = 6. 3 + 0. 9 = 1. 4