第1周 · 每天5道 · 做完点答案自检 · 先准后快
| # | 题目 | 答案 |
|---|---|---|
| 1 | 345 + 278 = 进位 | 验算:623 - 278 = 345 ✓ |
| 2 | 567 + 389 = 进位 | 验算:956 - 389 = 567 ✓ |
| 3 | 2856 + 3749 = 进位 | 验算:6605 - 3749 = 2856 ✓ |
| 4 | 4578 + 2936 = 进位 | 验算:7514 - 2936 = 4578 ✓ |
| 5 | 9999 + 1 = 进位 | 验算:10000 - 1 = 9999 ✓ |
| # | 题目 | 答案 |
|---|---|---|
| 1 | 1002 - 567 = 借位 | 验算:435 + 567 = 1002 ✓ |
| 2 | 3000 - 1456 = 连续借位 | 验算:1544 + 1456 = 3000 ✓ |
| 3 | 5000 - 2789 = 连续借位 | 验算:2211 + 2789 = 5000 ✓ |
| 4 | 10000 - 3456 = 连续借位 | 验算:6544 + 3456 = 10000 ✓ |
| 5 | 8000 - 4927 = 借位 | 验算:3073 + 4927 = 8000 ✓ |
| # | 题目 | 答案 |
|---|---|---|
| 1 | 3.5 + 2.78 = 小数 | 验算:6.28 - 2.78 = 3.5 ✓ |
| 2 | 10 - 4.65 = 补0 | 验算:5.35 + 4.65 = 10 ✓ |
| 3 | 8.6 - 3.27 = 补0 | 验算:5.33 + 3.27 = 8.6 ✓ |
| 4 | 12.3 + 4.57 = 小数 | 验算:16.87 - 4.57 = 12.3 ✓ |
| 5 | 7.2 - 0.85 = 补0 | 验算:6.35 + 0.85 = 7.2 ✓ |
| # | 题目 | 答案 |
|---|---|---|
| 1 | 99 × 37 + 37 = 提取公因数 | 37提出来 → (99+1)×37 = 100×37 = 3700 |
| 2 | 25 × 32 × 125 = 好朋友 | 32=4×8 → (25×4)×(8×125) = 100×1000 |
| 3 | 101 × 56 = 拆数法 | 101=100+1 → 100×56+1×56 = 5600+56 |
| 4 | 36 × 99 = 拆数法 | 99=100-1 → 36×100-36×1 = 3600-36 |
| 5 | 25 × 44 = 好朋友 | 44=4×11 → (25×4)×11 = 100×11 = 1100 |
| # | 题目 | 答案 |
|---|---|---|
| 1 | 4567 + 3289 = 进位 | 验算:7856 - 3289 = 4567 ✓ |
| 2 | 6000 - 2387 = 借位 | 验算:3613 + 2387 = 6000 ✓ |
| 3 | 15.7 + 3.84 = 小数 | 验算:19.54 - 3.84 = 15.7 ✓ |
| 4 | 99 × 48 + 48 = 简便 | 48提出来 → (99+1)×48 = 100×48 = 4800 |
| 5 | 100 - 25 × 3 + 10 = 混合 | 先算乘法:25×3=75 → 100-75+10=35 |