第2单元 认识三角形和四边形-【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）

单元二 　 第 1 课时　 图形分类 4 年级 下 B 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　4. 1 + 0. 5 = 5. 6 + 0. 4 = 5 - 0. 9 = 6 + 0. 8 = 10 + 6. 1 = 2. 6 + 6. 2 = 8. 8 + 0. 8 = 9. 1 + 5. 6 = 8. 7 + 6. 5 = 4. 4 + 0. 6 = 0. 44 + 1. 2 = 0. 32 + 2 = 0. 45 + 1. 5 = 9 - 0. 7 = 4 - 2. 5 = 6 - 5. 8 = 8. 4 - 5. 2 = 1. 7 + 0. 56 = 12 + 0. 5 = 2. 6 + 1. 2 = 2. 3 - 1. 2 = 3. 2 - 1. 6 = 9 - 2. 8 = 5. 6 - 1. 4 = 1. 6 + 2. 4 = 0. 8 + 0. 25 = 3. 6 + 1. 7 = 9. 6 + 0. 2 = 20 + 0. 32 = 30 - 1. 7 = 12. 5 + 0. 6 = 12 - 4. 5 = 9. 7 - 4. 18 = 5. 34 + 0. 06 = 3. 2 + 4. 56 = 11. 8 - 5. 97 = 8. 1 - 2. 7 = 6. 93 - 2. 8 = 5. 08 + 1. 47 = 8. 06 + 4. 29 = 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　4. 95 + 6. 76 = 10. 01 - 9. 8 = 50. 2 - 9. 88 = 9. 88 + 0. 45 + 0. 55 + 0. 12 14. 5 + 9. 6 - 4. 5 21. 78 - 6. 57 + 8. 22 41 单元二 　 第 2 课时　 三角形分类 4 年级 下 B 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　3. 6 + 1. 5 = 3. 6 + 2 = 4. 5 - 2. 7 = 3. 6 + 0. 24 = 2. 8 - 1. 23 = 2. 8 + 3. 4 = 2. 8 + 5 = 2. 8 + 2 = 12 + 0. 5 = 2. 6 + 1. 2 = 2. 3 - 1. 2 = 3. 2 - 1. 6 = 9 - 2. 8 = 5. 6 - 1. 4 = 1. 6 + 2. 4 = 0. 8 + 0. 25 = 3. 6 + 1. 7 = 9. 6 + 0. 2 = 20 + 0. 32 = 30 + 1. 3 = 30 - 5. 6 = 12. 6 + 3. 5 = 10 - 3. 5 = 1. 26 + 0. 2 = 1. 26 - 0. 2 = 3. 8 + 2. 4 = 4. 7 - 2. 8 = 2. 8 - 1. 23 = 7. 4 - 3. 2 = 1. 2 + 2. 35 = 10 - 5. 8 = 4. 5 + 2. 9 = 4. 3 + 1. 7 = 7. 3 - 2. 08 = 5 - 4. 27 = 6. 8 + 2. 78 = 6. 4 + 4. 6 = 0. 69 - 0. 6 = 5. 89 - 0. 98 = 3. 78 - 1. 2 = 4. 87 + 9. 3 = 　 　 　 　 　 　 　 　 9 + 14. 6 = 　 　 　 　 　 　 　 　 17. 2 - 2. 62 = 10 + (9. 55 - 8. 6) 20. 96 - 11. 38 - 7. 03 18. 2 - 0. 98 + 3. 27 51 单元二 　 第 3 课时　 探索与发现:三角形内角和 4 年级 下 B 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　4. 3 + 2. 5 = 8. 1 - 1. 7 = 5. 3 + 0. 8 = 3. 8 - 1. 3 = 2. 6 + 3. 6 = 4. 15 - 0. 2 = 8 - 2. 4 = 7. 5 + 1. 43 = 0. 4 + 8. 7 = 1. 4 - 0. 9 = 4. 5 + 3. 6 = 0. 28 + 0. 54 = 5 - 2. 7 = 7. 1 - 3. 8 = 8. 2 - 2. 9 = 9. 5 - 1. 7 = 2. 5 - 0. 8 = 10 - 9. 9 = 1 - 0. 98 = 10 + 0. 32 = 2. 3 + 9. 6 = 9. 3 + 5. 4 = 8 - 6. 5 = 12 + 0. 35 = 2